Thunderbird IMAP responded: User is authenticated but not connected

Anonymous
2022-12-27T12:29:12+00:00

Since yesterday, my Thunderbird client cannot connect to the outlook.office365.com IMAP server and other users at my university are also having this problem. I have deleted the stored token and redone the connection procedure but it does not work. I get two error messages:

The current operation on 'inbox' did not succeed. The mail server for account ... (IMAP) responded: User is authenticated but not connected.

Server outlook.office365.com has disconnected. The server may have gone down or there may be a network problem.

This does not work on any platform: Windows, Linux or Macos. Via the browser, we can access the emails but it is a workaround because it does not support openPGP. We need Thunderbird

Outlook | Web | Outlook.com | Account management, security, and privacy

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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Anonymous
2022-12-28T22:03:29+00:00

Hi Glenn,

Which version of Thunderbird are you using.

I have 102.6.1 which is the latest one. Can you try updating it if its not and then check.

Also under Thunderbird --> Click on the gear icon on the bottom left bar --> General --> Config Editor --> Show All

Type network.dns.dis in the search field

Select the very first option and click on the toggle arrow on the right, make it true

Close and reopen Thunderbird.. See if this helps

Let me know how it goes

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Anonymous
2022-12-28T21:34:14+00:00

Yes, it is worked for me too!

I just disabled ipv6 netwotking in thunderbird advanced configuration editor (network.dns.disableIPv6 = true)

and it is works again like a charm!

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  2. Anonymous
    2023-01-06T07:11:55+00:00

    Thank you for your answer. I get the following error message in german:

    *Die Nachricht wurde gesendet, aber es wurde keine Kopie im Gesendet-Ordner (Sent Items) gespeichert, da es zu Problemen bei dem Zugriff auf Netzwerk oder Dateien kam.Sie können es erneut versuchen oder die Nachricht lokal unter Lokale Ordner/Sent *****@access.uzh.ch speichern.

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  3. Anonymous
    2023-01-05T23:25:51+00:00

    The mail system seems to work after having set Network.dns.disableIPv6 false -> true but I still get the error warnings. In addition I can't read the sent items an< more. How can I get rid of them?

    Auf deutsch: das Mail system im Thunderbirs programm funktioniert, aber ich kann die verschickten Mails nicht abrufen, weil sie nicht gespeichert werden. Die Fehlermeldungen kommen nach wie vor unverändert.

    Eric Berger

    Please could you provide details of the errors? Images would be helpful. Thankyou.

    Könnten Sie bitte Details zu den Fehlern angeben? Bilder wären hilfreich. Danke dir.

    There is another Microsoft error affecting IMAP which causes some Thunderbird users to see this:

    Es gibt einen weiteren Microsoft-Fehler, der IMAP betrifft und dazu führt, dass einige Thunderbird-Benutzer dies sehen:

    https://answers.microsoft.com/en-us/msoffice/forum/all/unable-to-subscribe-to-office-365-imap-folders/c9273f2c-b63c-4647-87ce-bab6625814e6

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