I have several email accounts with a specific provider. Since yesterday both POP3 and SMTP fail silently on all accounts and all email readers (Thunderbird on Linux, K9 on Android).
Thunderbird's debug console gives me a pretty cryptic and useless "mailnews.pop3.2: NetworkInterruptError: a Network error occurred"
All my accounts are configured to use SSL/TLS (and have been for 2 decades), but if I set it to 'None' I can login and see the messages, so it's not a passwd problem. So my guess is that it's some issue on the server side. I tried security.tls.version.min=1 and security.tls.version.enable-deprecated=true to no avail.
What can I do to diagnose this better ? Thunderbird doesn't give much info.
EDIT:
I don't know if this is the right command but if I do the following it seems to answer nothing. Is the server certificate missing ?
$ openssl s_client -showcerts -connect mail.myserver.com:995
CONNECTED(00000003)
write:errno=104
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no peer certificate available
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No client certificate CA names sent
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SSL handshake has read 0 bytes and written 319 bytes
Verification: OK
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New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
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EDIT 2
It was a permission problem on the server certificate. There's nothing I could have done on my side. It's solved now.