On Fri, Nov 08, 2024 at 04:17:32PM +0100, Danjel Jungersen via Postfix-users
wrote:
> 2024-11-08T16:14:09.034570+01:00 mail postfix/submissions/smtpd[107564]:
> connect from unknown[192.168.1.1]
You're perhaps doing source NAT on external client IPs, which would make
your logs less useful.
> 2024-11-08T16:14:09.042051+01:00 mail postfix/submissions/smtpd[107564]:
> warning: TLS library problem: error:0A0000C1:SSL routines:
> :no shared cipher:../ssl/statem/statem_srvr.c:2220:
>
> Can anyone tell me what this means?
The remote client (after a plausible source NAT rewrite to what is
likely your router IP) proposed no TLS ciphers supported by your
server. Perhaps a security scan from shodan, or similar, but with the
IP addres obfuscated, not possible to say more.
Don't source NAT remote client IPs.
--
Viktor.
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