[Bug 1873746] Re: kmail in Kubuntu 20.04 beta cannot connect to dovecot IMAP server

[Chris Samuel]

Hi there,

I have a strong suspicion that this is SSL related.

I've found that this does not work:

openssl s_client -connect example.com:993
[...]
139765775537472:error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small:../ssl/statem/statem_clnt.c:2149:
[...]

but this does (found here: https://imlc.me/dh-key-too-small ):

openssl s_client -connect example.com:993 --cipher 'DEFAULT:!DH'

Now the received wisdom is that this is because of OpenSSL configuration
and you can fix it by adding this to /etc/ssl/openssl.cnf:

[system_default_sect]
MinProtocol = TLSv1.2
CipherString = DEFAULT at SECLEVEL=2

However, that does not seem to work, either for the OpenSSL command line
or for Akonadi.

All the best,
Chris

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Title:
  kmail in Kubuntu 20.04 beta cannot connect to dovecot IMAP server

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