Perdition - Dovecot - Roundcube

I have a perdition server that is proxying for a Roundcube webmail as 
well as all the various other email clients out there.  On occasion 
while a user is moving around their mail folders or opening emails 
perdition will disconnect from the dovecot servers.

I get this error in the dovecot servers log:

dovecot: IMAP(username): Connection closed

That is the only thing I can see anywhere that indicates something 
wrong.  Most clients complain about a connection problem of some kind 
then go on with life.  Roundcube is a pain because when it happens it 
kills the session and logs the user out.  I updated to the latest 
perdition and the issue hasn't gone away.

I am using Centos 5 which comes with dovecot 1.0.7 installed.  I know 
that is an old version but I don't really want to mess with it and make 
it break if I update other parts of the server using the supported yum 
repos.  I also am not sure it has anything to do with the dovecot server 
since if I point roundcube or another client directly at the dovecot 
server without going though perdition it works with no issue.  I would 
like to find a solution with perdition since I have built a mail system 
around it using 9 different mail hosts and one central point to check 
your mail.  I will look into updating the dovecot servers if that is 
what it takes but I would like to avoid it if possible until they are 
updated by the usual yum update.

I have looked for ip limits but I don't see any in that version of 
dovecot.  If I add the 'mail_max_userip_connections = 100' to the config 
file dovecot will not even start so this version does not support it.  I 
moved the connection_limit in perdition up way past what the number of 
connections that could possibly hit is and it didn't change the behavior.

One thing that I noticed that is a little different is when the client 
is connecting directly it logs in using "A0002 AUTHENTICATE PLAIN 
somelongstringofnumbersandletters".  When it is going through perdition 
it logs in like this:

flim08 LOGIN {7}
+ OK
username {8}
+ OK
password
flim08 OK Logged in.

I don't know if that makes any difference.

Thank you for any assistance.

Mark

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