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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: aladdin on December 24, 2010, 07:29:21 PM
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I am long time user of Avast! Free with Windows Firewall or Outpost Firewall PRO.
About two months ago, I tested quite a few Firewall Programs including Avast! Internet Security on my two laptops. In the end, I had to reformat both my two laptops as I couldn't access anyone on my home network, including the NAS Server.
At that time I couldn't pinpoint to anything. I tried everything I know before formatting these two computers.
About a month ago, I bought Avast! Internet Security for my computers. Installed them on all computers. The initial problems I faced were as follows:
1. It didn't turn off the Windows Firewall. I turned it manually. I understand it co-exist with Windows Firewall, but Windows Firewall kept on turning itself.
2. I had some exotic IP addresses for my home network, which I added the range as "Friends" to the suite. The Firewall kept on deleting it randomly. So on all my equipment I went back and set them as default IP 192.168.1.xxx range, as it is already included by default in the "Friends", which cannot be deleted randomly.
Now I have the following problems on all three laptops.
Laptop A: It has Windows Home Premium x64. Again after few weeks, I cannot access anyone on the home network, but they could access my laptop.
Laptop B: It has Windows Home Premium x64. Few days later it created the same problem and it couldn't access anyone on the home network. I removed Avast! Internet Security in the Safe Mode with "Avast! Uninstall Utility." Rebooted, installed Avast PRO but couldn't turn on the Windows Firewall. Went back in Safe Mode and cleaned Avast! PRO with "Avast! Uninstall Utility.". Rebooted again and still couldn't turn on Windows Firewall. Had to fix it with Microsoft Fix It Center.
a. Before doing all that I ran the "ComboFix" first.
b. Still cannot access anyone on the home network.
Laptop C: It has Windows Home Premium x64. Yesterday, it created the same problem as Laptops A and B.
Please note:
1. All the laptops are only used at home.
2. They all have only one operating systems on them.
Kind regards,
aladdin!
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See if this helps : http://forum.avast.com/index.php?topic=68175.0
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Thank you NMB for your help. Tried the solution on Laptop A (Windows 7 x64) and Laptop C (Windows 7 x32). It didn't work on these two computers.
And, on Laptop B, I have already uninstalled the Avast! Firewall and still I cannot access the network.
Best regards,
aladdin!
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If you have same symptoms across multiple PC's on your LAN, no matter what FW is on them or not, you might want to look to your router.
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Hi Gargamel360,
No problem with routers and other computers on the network. The problem is only with those laptops which have Avast! Firewall. Even I uninstalled the Avast! Firewall on one of these laptops and still the problem continues.
I have tried everything and this has been going on for the last two months.
In the last 15 years, never had such a problem in my home network.
Kind regards,
aladdin!
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I am long time user of Avast! Free with Windows Firewall or Outpost Firewall PRO.
About two months ago, I tested quite a few Firewall Programs including Avast! Internet Security on my two laptops. In the end, I had to reformat both my two laptops as I couldn't access anyone on my home network, including the NAS Server.
Hi aladdin and welcome: This sounds like a real mess up!
You stated you "tested quite a few Firewall Program" and they are the hardest to rid your sytem of reminents left behind long after we think we uninstall the Firewall properly.Back in the day it took me and some tech friends of mine 2months to TOTALLY get rid of ZoneAlarm..that software litterally took over my system >:(
I don't know if my experience will help...so take it with a grain of salt. :-\
Here is what I have done with great success;
I pet peave (hobby) of mine is seeking out and testing all kinds of Security Software and mostly interested in Anti-Virus and especially a"Firewalls" I have found over the years it is absolutely essential that when uninstalling a Firewall that first you download the VENDERS Uninstall/Clean up Utility for that specific piece of softward (In your case a different Uninsall tool from each vender that sells/supports that particular Firewall.
Many Firewalls are EXTREMELY hard to get rid of left over reminent (Registry Keys and Drivers especially).
So for every Firewall installed you should first remove with the product UNinstall option in it Start/Programs/Product Folder....If the product doesn't come with an Unistaller option, you then uninstall from Add and Remove Section.
You then need to run each Uninstall/Clean up Utility in safe mode supplied by the vender (which you should already have located and downloaded to Special file related to the product in represents (for easy access when needed)
THis process should be followed(or should have been) for every Firewall you had installed on your sytem at any time.
After that time consuming process is completed , You are not done yet.
Noe go to C:/WINDOWS/Temp folder and delete everything in that folder. [ Mske sure you have "show hidden folders" ticked in the Windows Explorer Tools Section under Folder Options]
Then go to Documents and Settings/User(YOUR ACCOUNT)/Local Settings/Temp and delete everything in that folder.
There 1s an amazing amount of file data and settings that are left behind in these folders, even with the Uninstll tools being used
Now you are getting closer to being finished
Run a Registry Cleaner that you trust ( I use JV16 Power Tools 2010..60 day free trial) and a Disk Defrag. Now reboot and Install the product you want to use.
This process has worked for me everytime I could not get a Firewall to function properly
Try everything else you feel might work first
NOTE: THis should be looked at as a last resort due to the time involved (around an hour or more) :-\
Good luck if you cannot succeed in any other way and choose to go this route.
Let me Know either way. :)
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Hi schmidthouse,
Thank you for a detailed reply. All three laptops only had Windows Firewall and then I installed Avast! Internet Security.
Laptop A has lots of kernel level software including Returnil Safe (Antivirus turned off), but no other Firewall installed on it, after being reformatted a month ago.
Laptops B and C, hardly have anything installed on them and they are hardly in use by my wife and daughter respectively.
Laptop A, which belong to me has JV16 Power Tools 2010 installed on it and a batch file which I use on daily basis to clean the Temp folders.
Kind regards,
aladdin!
Merry Christmas and Happy New Year!
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@aladdin
Can you try doing this : Right click on the network icon in the system tray > open network and sharing center > in the left hand column select home group > change advanced settings > change the settings the way you want > save changes.
If that doesn't work, please download this tool : http://www.rizone3.com/archives/1308 and select the reset windows firewall (I have assumed tat you have removed the avast firewall temporarily) configuration and repair workgroup computers view and hit go.
Let us know what you did and what happened.
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@aladdin
Can you try doing this : Right click on the network icon in the system tray > open network and sharing center > in the left hand column select home group > change advanced settings > change the settings the way you want > save changes.
Dear NMB,
Thanks for all your suggestions. Tried the above and it didn't work. The network discovery and file sharing was already on. I turned it off and on again, but still it didn't work on Laptop B, on which I had removed the AIS and have Windows Firewall.
If that doesn't work, please download this tool : http://www.rizone3.com/archives/1308 and select the reset windows firewall (I have assumed tat you have removed the avast firewall temporarily) configuration and repair workgroup computers view and hit go.
Let us know what you did and what happened.
Thank you for such a nice utility. I have added this to my "Treasure Chest of Utilities". As mentioned above on Laptop B, I already had removed the AIS, now have Avast Pro and Windows Firewall on it. Ran the above utility, checked to repair everything and when finished it asked me to reboot.
After reboot everything changed to it's default value. Inserted the static IP address in the WiFi connection, turned on the network and file discovery and it still didn't work. I cannot access the other computers on the network.
I can ping the IP address and the name of each computer, but I cannot access them.
Best regards,
aladdin!
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1. What other security software, including antivirus, trial security software (pre-installed), other security software (on-demand or resident) do you currently have or had in the past on these machines (A, B, C)?
2. Was everything running fine on your machines prior to running ComboFix?
3. Also, have you reset your router? Reset the router to its default configuration. This can be done by inserting something tiny like a paper clip end or pencil tip into a small hole labeled "reset" located on the back of the router. Press and hold down the small button inside until the lights on the front of the router blink off and then on again (usually about 10 seconds).
Sometimes malware can prevent security software from being installed properly. In addition, malware can spread through your network. Please run the following on your main machine; you may need to do this on the others depending on the report:
4. Check your computer for malware with Malwarebytes’ Anti-Malware (MBAM).
· Download free http://www.malwarebytes.org/ (http://www.malwarebytes.org/) (the blue button) for an on-demand scanner.
· Double Click mbam-setup.exe to install the application.
· After install, click update so you have latest database before scanning.
· Under Settings:
o General: Automatically Save File After Scan Completes is checked off
o Scanner Settings: Check all boxes
o Updater: Download and install update if available is checked off
· Once the program has loaded, select "Perform FULL Scan", then click Scan.
· The scan may take some time to finish, so please be patient.
· When the disinfection scan is complete, a log will appear in Notepad and you may be prompted to Restart. (See Extra Note).
· Click the “remove selected” button to quarantine anything found. You will find the infection details under the Quarantine tab.
· The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
· Copy & Paste the entire report in your next reply. Thank you.
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@ aladdin
Can you go through this : http://windows.microsoft.com/en-US/windows-vista/Troubleshoot-network-connection-problems and check everything is fine? Sometimes manual helps.
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yeah, formatting a system because of a network issue ::) as to exotic local IPs, that's the DHCP from Windows messing around when something's wrong with the firewall; i.e. the router isn't recognized anymore and Windows overrides the local IP management. Uninstalling the third party product (firewall) and rebooting solves the issue.
If you still have problems after that, your system is broken and/or infected.
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1. What other security software, including antivirus, trial security software (pre-installed), other security software (on-demand or resident) do you currently have or had in the past on these machines (A, B, C)?
Dear SafeSurf,
Thank you for taking the time out to help me. The easiest machines are Laptops B and C, which belongs to my wife and daughter respectively.
On Laptop B, I have removed the AIS and turned on the Widows Firewall and on Laptop C, I have still left the AIS. Both these machines were bought about 18 months ago and had Avast! Free and Windows Firewall on them. No other AV or Firewall installed on them until last month, when I installed AIS on them.
2. Was everything running fine on your machines prior to running ComboFix?
Yes, this was done two days ago on Laptop B when I suddenly couldn't access others on the network. ComboFix didn't find anything.
3. Also, have you reset your router? Reset the router to its default configuration. This can be done by inserting something tiny like a paper clip end or pencil tip into a small hole labeled "reset" located on the back of the router. Press and hold down the small button inside until the lights on the front of the router blink off and then on again (usually about 10 seconds).
No, I have not reset the router. However, I used to have some exotic IP (134.213.167.x) for the last ten years. I have now changed it to 192.168.1.x and the workgroup to "workgroup". Lots of work involved in it.
Also, I assign static IP addresses.
Sometimes malware can prevent security software from being installed properly. In addition, malware can spread through your network. Please run the following on your main machine; you may need to do this on the others depending on the report:
I am not sure what do you mean by main machine. Here is what I have on my home network:
1. Buffalo NAS Server
2. IOmega ScreenPlay Director x3
3. Desktop Computers x3
4. Laptops x6
5. iPads x2
6. Various HTC Phones
7. ADSL with wireless connected to:
8. Access Point x8 with wires to increase the wireless range and to connect the desktops x3 through LAN.
4. Check your computer for malware with Malwarebytes’ Anti-Malware (MBAM).
· Download free http://www.malwarebytes.org/ (http://www.malwarebytes.org/) (the blue button) for an on-demand scanner.
· Double Click mbam-setup.exe to install the application.
· After install, click update so you have latest database before scanning.
· Under Settings:
o General: Automatically Save File After Scan Completes is checked off
o Scanner Settings: Check all boxes
o Updater: Download and install update if available is checked off
· Once the program has loaded, select "Perform FULL Scan", then click Scan.
· The scan may take some time to finish, so please be patient.
· When the disinfection scan is complete, a log will appear in Notepad and you may be prompted to Restart. (See Extra Note).
· Click the “remove selected” button to quarantine anything found. You will find the infection details under the Quarantine tab.
· The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
· Copy & Paste the entire report in your next reply. Thank you.
Here is the log from MBAM for the Laptop B:
Malwarebytes' Anti-Malware 1.50.1.1100
www.malwarebytes.org
Database version: 5391
Windows 6.1.7600
Internet Explorer 8.0.7600.16385
25-12-2010 02:28:29 PM
mbam-log-2010-12-25 (14-28-29).txt
Scan type: Full scan (C:\|D:\|)
Objects scanned: 241682
Time elapsed: 30 minute(s), 18 second(s)
Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0
Memory Processes Infected:
(No malicious items detected)
Memory Modules Infected:
(No malicious items detected)
Registry Keys Infected:
(No malicious items detected)
Registry Values Infected:
(No malicious items detected)
Registry Data Items Infected:
(No malicious items detected)
Folders Infected:
(No malicious items detected)
Files Infected:
(No malicious items detected)
Kind regards,
aladdin!
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@ aladdin
Can you go through this : http://windows.microsoft.com/en-US/windows-vista/Troubleshoot-network-connection-problems and check everything is fine? Sometimes manual helps.
Dear NMB,
Once again thank you for your kind help. I will try them later and will let you all know the result.
Best regards,
aladdin!
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yeah, formatting a system because of a network issue ::) as to exotic local IPs, that's the DHCP from Windows messing around when something's wrong with the firewall; i.e. the router isn't recognized anymore and Windows overrides the local IP management. Uninstalling the third party product (firewall) and rebooting solves the issue.
If you still have problems after that, your system is broken and/or infected.
Dear Logos,
Please see my above post number 9. The DHCP is set to manual rather than automatic in my home network. There was no third party firewall installed on the three Laptops A, B and C until one month ago. A month ago, I installed AIS on them.
When I started having problem and not being able to access other on the network from these laptops, I changed the exotic IP range to default IP range 192.168.1.xxx
Many thanks,
aladdin!
Merry Christmas and Happy New Year!
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when DHCP is messing on Windows, changing the IP to one expected by the router (192.etc...) doesn't change anything. You still won't be able to connect ;D
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when DHCP is messing on Windows, changing the IP to one expected by the router (192.etc...) doesn't change anything. You still won't be able to connect ;D
Thanks for your reply and it is very true. However, I was simply trying to go back to default settings to eliminate any problems.
The Laptops A, B and C worked perfectly, even when I installed AIS on them. After a while Laptop A couldn't access any computers on the network. However, it could be and still can be accessed by other computers on the network.
I could still go on the internet and surf. I am writing this post from this laptop.
Then Laptop B created the same problem and then Laptop C. These three laptops cannot access any other computers on the network, but they could be accessed by others.
From these laptops, I could ping by IP and by name and I get response. Microsoft Fix-It doesn't show any errors.
Best regards,
aladdin!
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1. What other security software, including antivirus, trial security software (pre-installed), other security software (on-demand or resident) do you currently have or had in the past on these machines (A, B, C)?
Dear SafeSurf,
I believe I have replied to all your queries. Waiting for your further response!
I have scanned the Computer A by MBAM too, and if you want I can post the results for it too!
Best regards,
aladdin!
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On Laptop B, I have removed the AIS and turned on the Widows Firewall and on Laptop C, I have still left the AIS. Both these machines were bought about 18 months ago and had Avast! Free and Windows Firewall on them. No other AV or Firewall installed on them until last month, when I installed AIS on them.
When you installed AIS on all 3 machines, did all 3 machines also have Avast Free on them prior to this and you upgraded from Free to AIS or did you do a clean install?
Did this problem happen after upgrading or installing AIS?
Laptop B's MBAM is clean (for now), but because you are on a network, all machines should be checked.
Have you tried an Avast Repair (only the machines that have Avast on them):
- Go to Control Panel > Add/Remove programs > Avast Antivirus.
- Scroll down and choose Repair function in the pop-up window.
- Reboot.
Depending on if you upgraded or did a clean install and if the Repair works/fails, you may need to do a clean install of AIS:
1. Save a copy of newest version of Avast (5.0.677) and save it to your HDD:
AIS – http://files.avast.com/iavs5x/setup_ais.exe (http://files.avast.com/iavs5x/setup_ais.exe)
2. Download the Avast Uninstall Utility, aswClear5.exe http://www.avast.com/uninstall-utility (http://www.avast.com/uninstall-utility) and save it to your HDD.
3. Disconnect from the Internet at this time.
4. Go to Control Panel and uninstall Avast through Add/Remove Programs if possible and reboot.
5. If Step 4 fails, boot into Safe Mode (http://Safe Mode) (hit F8 repeatedly) and run the Avast Uninstall Tool. Uninstall ALL previous products of Avast on your machine at this time (Avast 5.0, AIS, etc.).
6. Reboot.
7. Install the newest version of Avast and reboot.
8. Get Internet access and register your license key for AIS.
9. Update the Avast definitions.
If problems, check to make sure AIS firewall allows avastSvc.exe internet access.
- If it does, delete the entry for it and reconnect to the Internet. This should force the firewall to ask permission again.
If you continue to have problems, this does not look like an Avast issue, but something more we will have to explore. Let us know how this goes. Thank you.
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When you installed AIS on all 3 machines, did all 3 machines also have Avast Free on them prior to this and you upgraded from Free to AIS or did you do a clean install?]
On Laptop A it was clean install of AIS, after reformatting. On Laptops B and C I upgraded from Avast! Free and Windows Firewall to AIS. But first I removed the Avast! Free in Safe Mode with their cleaning utility.
Did this problem happen after upgrading or installing AIS?
Yes, on all three laptops within one month of install.
Laptop B's MBAM is clean (for now), but because you are on a network, all machines should be checked.
I will do that, but I don't think I will find any. Question:
Do I need to install Antivirus:
1. On Buffalo NAS Server?
2. IOmega ScreenPlay Director x3?
Have you tried an Avast Repair (only the machines that have Avast on them):
- Go to Control Panel > Add/Remove programs > Avast Antivirus.
- Scroll down and choose Repair function in the pop-up window.
- Reboot.
Depending on if you upgraded or did a clean install and if the Repair works/fails, you may need to do a clean install of AIS:
1. Save a copy of newest version of Avast (5.0.677) and save it to your HDD:
AIS – http://files.avast.com/iavs5x/setup_ais.exe (http://files.avast.com/iavs5x/setup_ais.exe)
2. Download the Avast Uninstall Utility, aswClear5.exe http://www.avast.com/uninstall-utility (http://www.avast.com/uninstall-utility) and save it to your HDD.
3. Disconnect from the Internet at this time.
4. Go to Control Panel and uninstall Avast through Add/Remove Programs if possible and reboot.
5. If Step 4 fails, boot into Safe Mode (http://Safe Mode) (hit F8 repeatedly) and run the Avast Uninstall Tool. Uninstall ALL previous products of Avast on your machine at this time (Avast 5.0, AIS, etc.).
6. Reboot.
7. Install the newest version of Avast and reboot.
8. Get Internet access and register your license key for AIS.
9. Update the Avast definitions.
If problems, check to make sure AIS firewall allows avastSvc.exe internet access.
- If it does, delete the entry for it and reconnect to the Internet. This should force the firewall to ask permission again.
I will try the above.
If you continue to have problems, this does not look like an Avast issue, but something more we will have to explore. Let us know how this goes. Thank you.
If this continue, I guess I will open a ticket with support and upload the firewall log to them. I hate to format again and again all these computers.
Kind regards,
aladdin!
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Here is what the log shows on Laptop A until December 12, when suddenly I couldn't access other computers on the network:
Block Devices on Network (Remote IP Addresses - Other Laptops,Desktops, Routers, ....) Remote Port (Many) Local Address (239:255:255:250) Local Port (1900)
Question:
How do I save this log before uninstalling the AIS?
Best regards,
aladdin!
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1. Before you uninstall anything, for those machines that still have AIS on them, please run a mini-dump file:
Here is additional information on how to invoke a memory dump file: http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71 (http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71).
Please, zip and upload the C:\Windows\Memory.dmp file to this anonymous ftp server and name it uniquely (machine #A and your name): ftp.avast.com/incoming (http://ftp.avast.com/incoming). Avast will analyze it and respond back to you in this thread or to your email. There may be a slight delay because of the holiday.
2. After doing the dump file, try the Avast Repair first before doing any uninstall. If you did a clean install initially, you should not have to do another clean install. A repair might help, but only after doing the dump file.
3. Run MABM on the other machines and if clean just report machine A and C came back clean with MBAM. Otherwise, cut and paste the report.
4. Do you have any kind of AV on Laptop B now?
5. Don't open a support ticket as long as you are doing a mini-dump file. This will be quicker. Let me know when you do it and I will alert Avast to help matters.
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1. Before you uninstall anything, for those machines that still have AIS on them, please run a mini-dump file:
Here is additional information on how to invoke a memory dump file: http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71 (http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71).
Please, zip and upload the C:\Windows\Memory.dmp file to this anonymous ftp server and name it uniquely (machine #A and your name): ftp.avast.com/incoming (http://ftp.avast.com/incoming). Avast will analyze it and respond back to you in this thread or to your email. There may be a slight delay because of the holiday.
2. After doing the dump file, try the Avast Repair first before doing any uninstall. If you did a clean install initially, you should not have to do another clean install. A repair might help, but only after doing the dump file.
3. Run MABM on the other machines and if clean just report machine A and C came back clean with MBAM. Otherwise, cut and paste the report.
Dear SafeSurf,
Once again thank you taking the time out and helping me. How is the weather in your area? We see on the news that in some parts of USA it is very bad.
Last night I stayed up very late and ran MBAM on all machines. Once finished I kept that machine off, until I ran MBAM on each and every machine and shutting them off. Once all the machines were tested for viruses than I turned them back on again. Didn't find anything.
On Laptop A, I had earlier removed the firewall portion from AIS and then re-installed it. On machine B, I had uninstalled AIS. On Laptop C, I still have the AIS installed.
I took the memory dump on Laptop C and it about 2gb. After running 7 zip on it, now it is down to about 450mb. With my ADSL speed it will take about a whole day to upload it, so I don't know what to do?
My ADSL has download speed of 512mb and about 1/10 of that is the upload speed.
4. Do you have any kind of AV on Laptop B now?
5. Don't open a support ticket as long as you are doing a mini-dump file. This will be quicker. Let me know when you do it and I will alert Avast to help matters.
On Laptop B, when I uninstalled AIS, right then I installed Avast! PRO in trail mode. I will not open a ticked and wait for your further advise and response.
Kind regards,
aladdin!
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Regarding the size of your dump files, since they are so large, can you break them down into smaller sizes? Perhaps Laptop A, and Laptop B and C? Or do all 3 separately? I hate to make more work for you. If this is too inconvenient for you, them by all means, feel free to open a ticket. By doing the dump file, Avast can analyze everything, then report back what the problem is. By opening a ticket, you are starting over from the beginning, however you can mention the link to this thread to help. Please let me know what you would like to do. Thank you.
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Regarding the size of your dump files, since they are so large, can you break them down into smaller sizes? Perhaps Laptop A, and Laptop B and C? Or do all 3 separately? I hate to make more work for you. If this is too inconvenient for you, them by all means, feel free to open a ticket. By doing the dump file, Avast can analyze everything, then report back what the problem is. By opening a ticket, you are starting over from the beginning, however you can mention the link to this thread to help. Please let me know what you would like to do. Thank you.
Thanks for the reply. The dump for only Laptop C is about 450mb and I haven't created the dump files for Laptops A and B. I think I will open a ticket and give the link to this thread and ask them if the log files be sufficient. Or, at the most, only the dump file of Laptop C.
Many thanks and kind regards,
aladdin!
P.S. I will keep you posted and your kindness is much appreciated!
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You're most welcome. If you do the dump file, let me know and I will contact Avast for you to alert them as well.
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You're most welcome. If you do the dump file, let me know and I will contact Avast for you to alert them as well.
I have opened a support ticked and most probably I will try to upload the memory dump file during night. I will keep you posted.
Kind regards,
aladdin!
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I have now completed the last three steps remaining from my side:
1. Remove all Access Points and only have the ADSL connected.
2. Reset the router to the factory default.
3. Assign the IP addresses automatically by DCHP instead of static IP addresses.
I have now tried everything that I can think of. It just boggles the mind!
Kind regards,
aladdin!
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Got a response from support to uninstall the stable version with the Avast! Removal Utility and install the beta version. Tried, but still the problem persists. So wrote back to support asking for help!
Best regards,
aladdin!
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Hi aladdin.
If the problem still persists with the beta version, i recommend you to create a topic and specify the problem so Avast! team can solve the issue.
Create your topic here: http://forum.avast.com/index.php?board=15.0 (http://forum.avast.com/index.php?board=15.0)
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I had the same problem and I am a very advanced user. The solution I found is so simple I feel like an idiot. :-\
On all affected machines leave the home group. Create a new home group and add all machines to the new group.
Problem solved. 8)
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Too bad, does not fix the problem. I'm not using any homegroup (so I left it). Default SAMBA file sharing with local credentials (connect with pc admin account's username and password) does not work when in or out of a homegroup. It's the firewall's fault, when uninstalled all is well.
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yup I tried the create a new homegroup-didn't work for me either.