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Topic: thunderbird imap/pop cannot connect

- iRedMail 1.3.1
- downloadable installer
- Linux debian 10
- LDAP
- Nginx

I have set all like in documentation, but my email client is not able to connect to server.
* IMAP service: port 143 over STARTTLS (recommended)

Aug 30 00:17:19 mail dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=195..., lip=192.168.0.3, TLS handshaking: SSL_accept() failed: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol, session=<E+BmiAuufvnDnm3W>

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Re: thunderbird imap/pop cannot connect

Are you running the latest Thunderbird? Seems yours doesn't use TLSv1.2.

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Does my reply help a little? How about buying me a cup of coffee ($5) as an encouragement?

buy me a cup of coffee

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Re: thunderbird imap/pop cannot connect

I have updated it but still no luck

Sep  5 10:57:41 mail dovecot: imap-login: Disconnected (no auth attempts in 1 secs): user=<>, rip=195.158.109.214, lip=192.168.0.3, TLS handshaking: SSL_accept() failed: error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate: SSL alert number 42, session=<us2KLY2uf/PDnm3W>

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Re: thunderbird imap/pop cannot connect

- Any related error in Dovecot log files under /var/log/dovecot/? Especially dovecot.log.
- Could you please take a screenshot of the IMAP settings in Thunderbird?

----

Does my reply help a little? How about buying me a cup of coffee ($5) as an encouragement?

buy me a cup of coffee

5

Re: thunderbird imap/pop cannot connect

After hours of work, I have finally solved it. It is caused only in windows workstation, with linux workstation is OK.
It is not caused by dovecot.

I will have to solve it with Gates or Thunderbird developers...