Disconnects on Director

[Tom Sommer]

Hi

I am seeing a lot of clients time out on my Director. I'm wondering if 
this is "normal" or there is some opportunity to tweak something?

Log line:
imap-login: Info: proxy(user at example.com): disconnecting 1.2.3.4 
(Disconnected by client: read(size=433) failed: Connection timed out(37s 
idle, in=939, out=3083)): user=<user at example.com>, method=CRAM-MD5, 
rip=1.2.3.4, lip=172.0.0.0, TLS: read(size=433) failed: Connection timed 
out, session=<P2kq7H91H4dZF/2O>

Any hints? Nothing is logged by the kernel.

2.3.2.1

-- 
Tom