1655288 - pop3 - "Connection was reset" after upgraded to version 78.0. No issue using version 68.8.0

Status: RESOLVED INCOMPLETE

(MailNews Core :: Networking: POP, defect)

Description

[Andrea Borsani]

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

After upgrade to version 78.0 https://releases.mozilla.org/pub/thunderbird/releases/78.0/win32/it/Thunderbird%20Setup%2078.0.exe, I attempted to download email from an account using "pop.fastwebnet.it" setting for incoming emails.

Actual results:

"Connection to pop.fastwebnet.it was reset" popup is shown within the lower right screen corner, also after attempted to reinstall version 78.0

However, downloading emails from a Gmail account is successful.

Installing 68.8.0 version, https://releases.mozilla.org/pub/thunderbird/releases/68.8.0/win32/it/Thunderbird%20Setup%2068.8.0.exe, everything works fine when using "pop.fastwebnet.it" setting for incoming emails.

Expected results:

Using the version 78.0 and after, emails should be downloaded successfully, using "pop.fastwebnet.it" setting for incoming emails.

Comment 1

[Alex Ihrig [:Thunderbird_Mail_DE]]

We have a similar message in the german support forums from a user who has not installed any add-ons. Nonetheless, using Safe Mode once fixed the problem for this user on pop.gmx.net, even if this is not what you would expect here.

Comment 2

[Andrea Borsani]

Hello everyone, thank you for your appreciated updates.
The issue still persists after upgraded to 78.1.1 version.

Comment 3

[Anje]

If you have been effected by Thunderbird 78 changing the minimum tls security level to TLSv1.2 and the server you get emails downloaded from is not using the most up to date protocol then you not be able to get access to server using original server settings. Suggest you test this by trying a reset of the minimum version which by default is now set to 3.

To test this you can do one of the following:
Using original server settings.
Menu app icon > Options.
Scroll all the way to the bottom and click on 'Config Editor' button.
Skip past the warning.
In search type: tls.version
Look for this line: security.tls.version.min
Double click on that line to open edit window
set the value to 1
click on OK

Restart Thunderbird.

If this gets you access, then you have a choice.
Either leave that setting in place
OR
Revert the setting for security.tls.version.min back to 3
and try changing the server settings to use:
Port : 110
Connection Security: try 'STARTTLS', if it still fails then try 'None'

Please report back on results as it would help to identify the issue.

Comment 4

[Wayne Mery (:wsmwk)]

(In reply to Anje from comment #3)

Please report back on results as it would help to identify the issue.

Andrea?

Comment 5

[Phoenix]

Resolved per whiteboard