Issue with LMTP proxying and port number

[Stephan Bosch]

Op 31/12/2018 om 23:59 schreef Steven Craig:
> Hello there,
>
> Everything was working fine on Dovecot 2.2.10 (on CentOS 7), but after 
> updating to version 2.2.36, our director servers are not able to proxy 
> LMTP.
>
> We are sending mail from exim to the local Dovecot LMTP socket, which 
> then used to send it to our internal mail servers on port 24.
>
> Besides the update, nothing has changed in the config files.  The 
> configuration has been working great for months … Then we had a great 
> idea of doing holiday maintenance.
>
> (Currently, we are working around this issue by having exim send mail 
> to the IP and port, instead of the socket.)
>
> Doing a tcpdump capture shows no TCP traffic either.  The logs seem to 
> say that it is trying to go to port 0, so my guess is that it’s not 
> getting the port directive from either static or sql — since the docs 
> state that if these settings aren't specified, it will always use the 
> same connection type for the proxy that it received the connection on.
>
> Any thoughts?  I can share config if necessary.

Yes, output from `dovecot -n` could be helpful.

Also a literal dump of those errors in the log could help.

Regards,

Stephan.