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IMAP server has unexpectedly disconnected

asked 2024-05-25 07:56:35 +0000

sugar76 gravatar image

On a client machine, we receive quite regularly error messages from the mail client

2024-05-24 16:10:42,578 [25] ERROR Betreuung.Service.EmailService2 Fehler beim E-Mail-Empfang für Konto [email protected].
Betreuung.Email.EmailServiceException: Konnte keine Verbindung zum E-Mail-Server mail.mediamor.de herstellen. Fehlermeldung: The IMAP server has unexpectedly disconnected.

I recorded a capture which you can find here.

First see the DNS query at packet no. 38. Then some TLS protocol packets are exchanged and at packet 69 and 70 something bad happens (don't know what).

Does the packet capture indicate an issue on my side or on the server's side? Does it provide any issue details which I oversee?

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The shared file is not public...

SYN-bit gravatar imageSYN-bit ( 2024-05-27 22:08:32 +0000 )edit

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answered 2024-05-28 10:24:10 +0000

SYN-bit gravatar image

Thanks for sharing the file, the RST packets in frame 69/70 are sent after a FIN from both sides, so that should be nothing to worry about. Some TLS libraries do this to clean up sessions.

Why the IMAP server disconnects the client can only be determined with decryption or from extended logging in the client or the server.

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Asked: 2024-05-25 07:56:35 +0000

Seen: 160 times

Last updated: May 28