Author Topic: Avast and Mozilla Thunderbird certificate problem  (Read 7386 times)

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Offline okocadere

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Avast and Mozilla Thunderbird certificate problem
« on: January 09, 2019, 11:45:51 AM »
After installing Avast Internet Security, email client Thunderbird always says that mail server certificate is invalid. I have looked for this issue and learned that I must import Avast certificate to the Thunderbird. There are some images about that but they belong to the older version of the Avast. And unfortunately, I could not find where I can export Avast email certificate on the latest version of Avast. Could you please help me with this issue?

Thank you

Offline Asyn

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #1 on: January 09, 2019, 12:08:06 PM »
1. Download Avast Internet Security: https://files.avast.com/iavs9x/avast_internet_security_setup_offline.exe
2. Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)
3. Reinstall Avast with the downloaded installer from point 1.
4. Reboot.
W8.1 [x64] - Avast PremSec 22.7.7366.BC [UI.713] - Firefox ESR 91.11 [NS/uBO/PB] - Thunderbird 91.11
Avast-Tools: Secure Browser 103.0 - Cleanup 22.2 - SecureLine 5.18 - DriverUpdater 22.2 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline okocadere

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #2 on: January 09, 2019, 12:36:00 PM »
Will this solve the problem?

Offline Asyn

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #3 on: January 09, 2019, 12:39:12 PM »
Will this solve the problem?
Most probably, yes.
W8.1 [x64] - Avast PremSec 22.7.7366.BC [UI.713] - Firefox ESR 91.11 [NS/uBO/PB] - Thunderbird 91.11
Avast-Tools: Secure Browser 103.0 - Cleanup 22.2 - SecureLine 5.18 - DriverUpdater 22.2 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline okocadere

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #4 on: January 09, 2019, 12:41:06 PM »
I asked you because my Avast was a fresh install on a new Windows

Offline Asyn

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #5 on: January 09, 2019, 12:42:35 PM »
- Which version of AIS..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?
W8.1 [x64] - Avast PremSec 22.7.7366.BC [UI.713] - Firefox ESR 91.11 [NS/uBO/PB] - Thunderbird 91.11
Avast-Tools: Secure Browser 103.0 - Cleanup 22.2 - SecureLine 5.18 - DriverUpdater 22.2 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline okocadere

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #6 on: January 09, 2019, 12:50:15 PM »
Version : 19.1.2360 (build 19.1.4142.0)
OS : Windows 10  Build: 18290
No other security software installed
I installed fresh windows 10 and then fresh Avast with above version. No other antivirus installed before and using now

Offline Asyn

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #7 on: January 09, 2019, 12:51:41 PM »
OK, follow the instructions from Reply #1 to the point and report back.
W8.1 [x64] - Avast PremSec 22.7.7366.BC [UI.713] - Firefox ESR 91.11 [NS/uBO/PB] - Thunderbird 91.11
Avast-Tools: Secure Browser 103.0 - Cleanup 22.2 - SecureLine 5.18 - DriverUpdater 22.2 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline chris..

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #8 on: January 09, 2019, 01:17:57 PM »
Version : 19.1.2360 (build 19.1.4142.0)

.... fresh Avast with above version.
Online (recommanded) or offline (Asyn #1 link) version ?

When Asyn says "Most probably, yes." it is not only about the fresh installation but also about installing with an "offline" version.Did you like this ?

Sorry if you understood correctly before and the procedure was followed to the letter.

Offline okocadere

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #9 on: January 09, 2019, 05:42:46 PM »
I did as you say. Uninstalled with uninstall.exe and then installed offline but unfortunately, it did not help. I need the avast mail shield certificate.

Offline Asyn

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #10 on: January 09, 2019, 05:56:25 PM »
OS : Windows 10  Build: 18290
Install a stable build of W10 and try again.
W8.1 [x64] - Avast PremSec 22.7.7366.BC [UI.713] - Firefox ESR 91.11 [NS/uBO/PB] - Thunderbird 91.11
Avast-Tools: Secure Browser 103.0 - Cleanup 22.2 - SecureLine 5.18 - DriverUpdater 22.2 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline okocadere

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #11 on: January 09, 2019, 06:28:45 PM »
Why are you talking about OS windows. The conflict is between Thunderbird and Avast. I think it is not about Windows... We should focus on right point to solve the problem

Offline Asyn

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #12 on: January 09, 2019, 06:32:19 PM »
Well, 18290 is no stable release of W10 and therefore not supported.
W8.1 [x64] - Avast PremSec 22.7.7366.BC [UI.713] - Firefox ESR 91.11 [NS/uBO/PB] - Thunderbird 91.11
Avast-Tools: Secure Browser 103.0 - Cleanup 22.2 - SecureLine 5.18 - DriverUpdater 22.2 - CCleaner 6.01
Avast Wissenswertes (Downloads, Anleitungen & Infos): https://forum.avast.com/index.php?topic=60523.0

Offline chris..

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #13 on: January 09, 2019, 08:02:39 PM »
Well, maybe I didn't read your first message correctly.

After installing Avast Internet Security, email client Thunderbird always says that mail server certificate is invalid. I have looked for this issue and learned that I must import Avast certificate to the Thunderbird. There are some images about that but they belong to the older version of the Avast. And unfortunately, I could not find where I can export Avast email certificate on the latest version of Avast. Could you please help me with this issue?

Thank you
Do you talk about this FAQ
https://support.avast.com/en-ww/article/Troubleshoot-invalid-email-certificate
if so, I understand why you didn't find it, avast often tends to complicate things  :-[
You can find the export of certificates in the new IU:
General->Troubleshooting->old settings .... then follow the FAQ above

very intuitive , isn't it  :'(  ;)  ;D
« Last Edit: January 09, 2019, 08:06:55 PM by chris.. »

Offline michaelsisi

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Re: Avast and Mozilla Thunderbird certificate problem
« Reply #14 on: January 10, 2019, 10:49:27 AM »
hey, i just had the same problem. with the new ui.

chris.. had the right solution, i was at troubleshooting already by myself but he found the right option.

thank you