[Dovecot] Pop3 hanging up after login.

[Timo Sirainen]

On Sat, 2011-08-27 at 15:13 -0300, Fabio Catunda wrote:

> I'm trying to implement a second dovecot server on a second machine to 
> try to load balance IMAP/POP3 services.
> The first machine is already running and is working pretty well with 
> dovecot-pop3d 1:1.0.15-2.3+lenny1. The
> new machine is running dovecot-pop3d 1:1.2.15-7 and accessing the 
> existing maildirs over a NFS share on /mnt/mail.

This is not a recommended setup. Read http://wiki2.dovecot.org/NFS
especially about caching.

> # telnet localhost 110
> Trying 127.0.0.1...
> Connected to localhost.
> Escape character is '^]'.
> +OK Bem Vindo.
> user my.user at mydomain.com.br
> +OK
> pass MySecret
> ... (Nothing else happens)
> 
> If I try to stop Dovecot with /etc/init.d/dovecot stop it stops, but the 
> pop3 process keep running and the only
> way to stop it is with kill -9.

Sounds like it hangs somewhere. Get gdb backtrace:

gdb -p <pid of the hanging pop3 process>
bt full