Author Topic: Blocking all stites - "Certifikate not valid"  (Read 9564 times)

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Offline DavidR

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Re: Blocking all stites - "Certifikate not valid"
« Reply #15 on: July 24, 2015, 08:55:19 PM »
Thanks DavidR,
I'm still on 2218.  I'm going to do a clean install of the latest release on my XP
box and check it out.

You're welcome,

I don't know if you have used the beta builds in the past, but there is a new one 10.3.2224, https://forum.avast.com/index.php?topic=174079.0.

I don't know if there is anything specific in there relating to this issue, though I didn't have this problem on this XP Pro SP3 system.
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 24.6.6121 (build 24.6.9241.848) UI 1.0.809/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security

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Re: Blocking all stites - "Certifikate not valid"
« Reply #16 on: July 25, 2015, 01:32:40 AM »
I have also been having this problem.  I had to install the prior avast version to get browsing to work in firefox.  it did not seem to block https sites in ie.   I tried using avastclear and reinstalling the latest version but that did not work.    when I was using the latest version I could browse sites if webshield was disabled.
« Last Edit: July 25, 2015, 01:35:02 AM by phil t »

Offline DavidR

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Re: Blocking all stites - "Certifikate not valid"
« Reply #17 on: July 25, 2015, 02:15:38 PM »
I have also been having this problem.  I had to install the prior avast version to get browsing to work in firefox.  it did not seem to block https sites in ie.   I tried using avastclear and reinstalling the latest version but that did not work.    when I was using the latest version I could browse sites if webshield was disabled.

You don't give any information on your OS or avast version and build number ?
Since this appears to be XP related, your system info might help.

Previous versions of avast, prior to avast 10.3.2223 didn't have support for https scanning in XP and Vista.
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 24.6.6121 (build 24.6.9241.848) UI 1.0.809/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security

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Re: Blocking all stites - "Certifikate not valid"
« Reply #18 on: July 25, 2015, 03:34:21 PM »
I have also been having this problem.  I had to install the prior avast version to get browsing to work in firefox.  it did not seem to block https sites in ie.   I tried using avastclear and reinstalling the latest version but that did not work.    when I was using the latest version I could browse sites if webshield was disabled.
I am using windows xp pro 64bit sp2 the version that is working is 2115.10.2.2215

Offline DavidR

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Re: Blocking all stites - "Certifikate not valid"
« Reply #19 on: July 25, 2015, 04:20:32 PM »
I have also been having this problem.  I had to install the prior avast version to get browsing to work in firefox.  it did not seem to block https sites in ie.   I tried using avastclear and reinstalling the latest version but that did not work.    when I was using the latest version I could browse sites if webshield was disabled.
I am using windows xp pro 64bit sp2 the version that is working is 2015.10.2.2215

In theory 2015.10.2.2218 should work also as isn't R3 2015.3.222x build.

Interesting that your XP Pro is 64bit, I wonder if others experiencing this are also using XP Pro 64bit, as I don't have the issue with XP Pro SP3 32bit.
Windows 10 Home 64bit/ Acer Aspire F15/ Intel Core i5 7200U 2.5GHz, 8GB DDR4 memory, 256GB SSD, 1TB HDD/ avast! free 24.6.6121 (build 24.6.9241.848) UI 1.0.809/ Firefox, uBlock Origin, uMatrix/ MailWasher Pro/ Avast! Mobile Security

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Re: Blocking all stites - "Certifikate not valid"
« Reply #20 on: July 26, 2015, 03:55:23 PM »
It is not likely they are using the 64bit version, I think the issue is with firefox, because it did not seem to happen in ie, but I only use firefox.  i am also using peerblock 1.2
« Last Edit: July 26, 2015, 04:02:15 PM by phil t »

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Re: Blocking all stites - "Certifikate not valid"
« Reply #21 on: August 01, 2015, 02:22:33 AM »
Hi!

It appears that new version of Avast is using a certificate with SHA256 hash algorithm for Web/Mail Shield protection. Unfortunately Windows XP SP2 doesn't support that algorithm, Microsoft made it available in SP3 (see here - section "Detailed Operating System Support").

Regards