Avast and Mozilla Thunderbird certificate problem

[okocadere]

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

[Asyn]

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.

[okocadere]

Will this solve the problem?

[Asyn]

Will this solve the problem?

Most probably, yes.

[okocadere]

I asked you because my Avast was a fresh install on a new Windows

[Asyn]

- Which version of AIS..?
- OS..? (32/64 Bit..? - which SP/Build..?)
- Other security related software installed..?
- Which AV(s) did you use before Avast..?

[okocadere]

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

[Asyn]

OK, follow the instructions from Reply #1 to the point and report back.

[chris...]

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.

[okocadere]

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.

[Asyn]

OS : Windows 10  Build: 18290

Install a stable build of W10 and try again.

[okocadere]

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

[Asyn]

Well, 18290 is no stable release of W10 and therefore not supported.

[chris...]

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     

[michaelsisi]

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