laplasz
October 12, 2024, 6:56pm
1
Just used /discourse-doctor and got the following error on mail test:
Not able to send email Net::ReadTimeout
Then I set DISCOURSE_SMTP_FORCE_TLS: true as recommended here: Cannot send email - problem with port 465 - #10 by schungx
But this time I got the following error:
TLS and STARTTLS are mutually exclusive
So, then I tried to test the TLS connection setup with openssl
openssl s_client -connect 127.0.0.1:465 -debug -msg
So that command failed as well. The connection was established but no negotiation at all.
CONNECTED(00000003)
laplasz
October 12, 2024, 7:00pm
2
The problem was with the mtu size of docker interface. I have a PPPoE connection which has less then 1500 bytes mtu size - so what I had to do is to set MSS clamping in iptables.
iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
More info about the solution can be found here: ssl - OpenSSL hangs at CONNECTED(00000003) - Stack Overflow
system
November 16, 2024, 2:01pm
3
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