courier-imap-ssl "server disconnect" error behind firewall

[Vadik]

I use courier-imap-ssl and I have mozilla connection to a few accounts 
at the same time, so my MAXPERIP=40.  With this setup I have absolutely 
no problem from home, but from the work I often get "server disconnect" 
error.  I think that firewall at my work is a problem, but is there 
anything I can do (with courier or mozilla configuration) to fix it?

Thanks,
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