dovecot - Aug 2012 - Error: Couldn't open INBOX: Timeout while waiting for lock

Hi ,

My users are frequetly getting the below error,

Aug 21 00:04:18 blade6 dovecot: pop3-login: proxy(hgl_dipak): Login failed to
192.168.1.43:110: [IN-USE] Couldn't open INBOX: Timeout while waiting for
lock.

We are proxing pop connections from one pop server (dovecot version 1.1.20) i.e
192.168.1.39 to the other pop Server (Dovecot version 2.0.16 ) i.e 192.168.1.4.


We have set? pop3_lock_session = yes and dont want to disable it.

Please Help !! :)


K.K

On 21.8.2012, at 8.42, Kavish Karkera wrote:
> My users are frequetly getting the below error,
> 
> Aug 21 00:04:18 blade6 dovecot: pop3-login: proxy(hgl_dipak): Login failed
to 192.168.1.43:110: [IN-USE] Couldn't open INBOX: Timeout while waiting for
lock.
> 
> We are proxing pop connections from one pop server (dovecot version 1.1.20)
i.e 192.168.1.39 to the other pop Server (Dovecot version 2.0.16 ) i.e
192.168.1.4.
> 
> We have set  pop3_lock_session = yes and dont want to disable it.
Are your users behind bad internet connections that leave dead connections lying
around? If so, maybe changing the kernel's TCP keepalive value to something
very aggressive (e.g. 10 secs) would fix those. Of course that makes other
traffic behave worse.