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Consumer Products => Avast Free Antivirus / Premium Security (legacy Pro Antivirus, Internet Security, Premier) => Topic started by: especially on March 18, 2018, 08:55:55 PM

Title: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: especially on March 18, 2018, 08:55:55 PM
I saw a previous post on this topic that was started in december, but when someone added to it today, poster was told to start a new topic. This is happening on my machine windows 7 64bit. Tried the "emergency update", uninstalled, reinstalled, but every time an avast window pop ups, I lose mouse and keyboard inputs. Also uninstalled reinstalled uvnc, tried 32bit and 64bit versions, went back to older versions of uvnc, still same behavior. Cannot send ctrl/alt/del with the Avast window open.

If I open the chat window and press the send key about 10 to 20 times, i get one shot to close avast window, but as soon as another Avast pop up window opens, same thing happens, lose mouse and keyboard control. It looks like this has been an issue since back in November. Does anyone have a fix, besides disabling Avast (not really a fix).

And what is up with these verification images, have to reset that 5 to 10 times before it can be read?
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: Asyn on March 19, 2018, 04:51:05 AM
And what is up with these verification images, have to reset that 5 to 10 times before it can be read?
Captcha is only needed for your first 3 posts. (Spam protection)
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: mitchkebie on March 27, 2018, 04:35:00 PM
Sounds like you have a case of the Avast blocking stuff! I had to completely uninstall my paid version of Avast so I could actually use software on my computer. Not even disabling the shields helped, a complete disable/uninstall was the only fix.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: bob3160 on March 27, 2018, 06:23:53 PM
Sounds like you have a case of the Avast blocking stuff! I had to completely uninstall my paid version of Avast so I could actually use software on my computer. Not even disabling the shields helped, a complete disable/uninstall was the only fix.
Sounds like a case of using drastic measures instead of getting help.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: John Becich on April 19, 2018, 06:22:11 PM
Avast isn't listening, and obviously doesn't care.     It's the bigger player in this matter of incompatibilities.       UltraVNC doesn't care, or is helpless to remedy this.         
"What we have here is a failure to communicate!"
Can anyone tell us if Windows 10 Remote Desktop remains free of this problem that so severely affects UltraVNC?
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: bob3160 on April 19, 2018, 06:38:52 PM
Avast isn't listening, and obviously doesn't care.     It's the bigger player in this matter of incompatibilities.       UltraVNC doesn't care, or is helpless to remedy this.         
"What we have here is a failure to communicate!"
Can anyone tell us if Windows 10 Remote Desktop remains free of this problem that so severely affects UltraVNC?
Quick Assist working without problems for me.

Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: igor on April 19, 2018, 11:17:40 PM
We haven't been able to reproduce the described issue, sorry.
For any report, please pack the main executable of the blocked tool (if unsure, the whole folder) and upload it somewhere - so that we can check how Avast classifies it. However, I'm afraid we haven't found any problem so far.

Remote Desktop certainly isn't affected by self-defense, it works differently (if you have Avast firewall, you may have to allow RD connections first though.)
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: wakemaker on May 07, 2018, 06:57:15 PM
I have this problem also. I use Splashtop Business to remote into about 75 computers. These pc's have a variety of Window's OS's.

If I try to disable Avast shields by right clicking on the Avast icon in the taskbar, I get the pop-up menu, then I can't do anything with the mouse or keyboard. The way out is to use the Splashtop interface on my end to send control-alt-delete and then log off or switch user on the remote end.

Disabling the Avast self defense module can't be done remotely. Several of the pc's I monitor are headless servers and are hundreds of miles away.

Splashtop does have a command to restart the remote pc in safe mode with networking and also starts Splashtop in this mode. Avast can be removed and Avast Clear can also be run from this mode. This is what I have done on the servers and will remove Avast from the others as well.



Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: dkeithmaxwell on June 01, 2018, 09:06:25 PM
I have the same problem as well.  I manage multiple clients using Splashtop Business and for clients that use Avast free and Avast Premier, initiating any user interface from Avast apps completely kills remote keyboard or mouse input.  There was a similar issue back in November (see: https://forum.avast.com/index.php?topic=210715.0) that was supposedly remedied, but its now May and this problem affects my clients with the latest versions of Avast supposedly installed.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: Peter427 on July 02, 2018, 11:26:43 AM
I have the same problem using UltraVNC.

- System Information
Windows Server 2012 R2 Standard
Avast Business Security 18.4.2534 (build 18.4.3895.327)
Virus definition 180702-0
TeamViewer Host 9.0.32494 (http://www.teamviewer.com)
UltraVNC Server 1.2.2.1 (http://www.uvnc.com)

UltraVNC is a code-signed executable.
It seems that UltraVNC is not in the list of trusted files because Team Viewer is working properly.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: John Becich on July 26, 2018, 05:44:10 AM
Thank you, Peter427, for the encouragement.    I have another "distant" Windows computer, this time it's a Windows 7 Pro host/server for UltraVNC, which is stymied as soon as the Avast control panel is raised.    But TeamViewer host/server works on that same computer without any snags whatsoever.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: John Becich on July 26, 2018, 05:23:27 PM
Thank you, Bob3160.       I have tested (on one host Win10 computer) and agree that Quick Assist is unencumbered by Avast.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: charlierainbow on July 26, 2018, 07:48:17 PM
I'll put my name in the ring here, too. Using UVNC 1.2.2.1, windows 7 ultimate, Avast Free, everything up to date as of this posting. See, for instance:

https://forum.ultravnc.net/viewtopic.php?f=3&t=34015 (https://forum.ultravnc.net/viewtopic.php?f=3&t=34015)

It's very frustrating that this problem persists. Someone at Avast please help!
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: bob3160 on July 26, 2018, 10:36:06 PM
Again reported to Avast on the Developers Channel. Let's hope that helps.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: especially on July 28, 2018, 08:40:58 PM
This workaround seems to work for now. Open Ultravnc and connect to the remote machine.

If the Avast window pops up, you can no longer control the remote computer. CTRL/ALT/Delete will not work.

Open the chat window. Click "send" (no need to enter text, just click send).

For some reason, you can now use CTRL/ALT/DELETE from the UltraVNC window (top left icon).

Start Task Manager. You should see Avast in the list of programs. End Avast. The pop up Avast window should disappear. This does not stop the Avast program from running, but it just closes the Avast Pop up and you should have control of theremote  machine again.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: charlierainbow on July 28, 2018, 11:48:47 PM
Especially,

Thanks. It seems to be all about that chat window. Nevertheless, it's still only a partial work-around in that, in the end, one still can't interact with Avast remotely. In my role as remote administrator, I'd sure like to be able to interact with the AV software!!
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: Spec8472 on July 30, 2018, 09:11:54 AM
Hi,
Avast is blocking all emulated user input coming from an unsigned process when an Avast window is the foreground window (the window which is receiving user input). This change was required, because there was an attack reported to avast bug bounty program, which was using user input emulation API to deactivate protection completely. TeamViewer has signed executables, so there shouldn't be problem with TeamViewer unless you are using a warez (modified) version of TeamViewer. Also please use latest Avast 18.5 version as there were some bugs in previous releases related to this issue. I have tested latest UltraVNC 64bit and it contains signed executables too, but it is possible that afflicted computers have obsolete (unsigned) version of UltraVNC.
Thanks
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: charlierainbow on July 30, 2018, 08:41:04 PM
Spec8472: thanks. That makes a lot of sense. Here's the rub: I'm using UltraVNC 1.2.2.1 (the latest version) and Avast 18.5.2342. So the problem is appearing even with the latest version of software. Thoughts?
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: Spec8472 on July 31, 2018, 10:53:10 PM
charlierainbow, can you please verify that "C:\Program Files\uvnc bvba\UltraVNC\winvnc.exe" executable really has digital signature? Is your UltraVNC  32bit or 64bit version? Thanks.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: charlierainbow on July 31, 2018, 11:47:59 PM
Spec8472, thanks for your continued interest. I'm happy to verify. How do I do this? UltraVNC64.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: Spec8472 on August 01, 2018, 12:08:02 AM
 charlierainbow, just right click the file in windows explorer, select properties in context menu, then there should be "Digital Signatures" tab in file properties dialog. Please select it. Name of signer should be "uvnc bvba"
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: charlierainbow on August 01, 2018, 03:24:48 AM
I can confirm that the executable is signed. uvnc bvba symantec class 3 valid 2016/08/22 to 2019/11/22 signed 18/06/07 14h31:05 uvnc 1.2.2.1 build 18/06/07 20h30:40.
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: Spec8472 on August 01, 2018, 02:29:31 PM
Thank you charlierainbow, unfortunately I am unable to reproduce your issue, can you please also verify that problem disappears if you disable self-defense in Avast troubleshooting settings? Can you also specify OS?
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: bob3160 on August 01, 2018, 02:52:52 PM

How to get to the Avast Settings, Licenses, Rewards and, Help
(https://screencast-o-matic.com/screenshots/u/Lh/1533127698646-76232.png)
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: ProfEngr on July 30, 2019, 03:44:32 PM
I've managed to get myself locked out of a PC thanks to this nice little "feature." Albeit due to me trying to turn off all the popups that were causing the problem in the first place. Using the chat window work-around gave me limited access to the system. However, when I opened the Avast app itself that no longer works and I'm unable to do anything with the PC now via UltraVNC. The chat window is now hidden behind the app and I have found no way to force it out of focus. I read in the forum that this was deemed necessary for some kind of exploit, but messing with a legitimate RDP-type program like this is really poor. Definitely so after the years of complaints showing up in the search. I was happy with AVG until your company acquired it. Then the user experience went downhill.
Why is it that after a certain amount of time almost all programs that started out strong run out of wind and collapse into a pile of crap?  :'(
Title: Re: Avast pop up windows blocks ultravnc teamviewer etc.
Post by: bob3160 on July 30, 2019, 03:51:07 PM
I've managed to get myself locked out of a PC thanks to this nice little "feature." Albeit due to me trying to turn off all the popups that were causing the problem in the first place. Using the chat window work-around gave me limited access to the system. However, when I opened the Avast app itself that no longer works and I'm unable to do anything with the PC now via UltraVNC. The chat window is now hidden behind the app and I have found no way to force it out of focus. I read in the forum that this was deemed necessary for some kind of exploit, but messing with a legitimate RDP-type program like this is really poor. Definitely so after the years of complaints showing up in the search. I was happy with AVG until your company acquired it. Then the user experience went downhill.
Why is it that after a certain amount of time almost all programs that started out strong run out of wind and collapse into a pile of crap?  :'(
Posting in a year old topic is senseless.
If you have a problem, start your own topic and explain your problem with as much detail as possible.