[Dovecot] Auth Issues - Urgent - Help!

[David Cunningham]

After a few hours of running, I get tons of the following errors in my logs:

dovecot: Oct 08 07:41:50 Error: auth(default):  
ldap(user at domain,x.x.x.x): Request queue is full

I removed the username and IP, obviously.

Any idea how to stop this?

I have about 5 Thousand users using horde that login ever 1-5 minutes  
to refresh their page.  I assume it is a setting, but I am confused as  
to why it doesn't happen almost right away.  It seems to take some  
time to build up.

Please help!  This is taking my webmail system down hourly.