Problems with idle pop3 connections locking mailboxes

Rob Siemborski rjs3 at
Tue Jul 13 09:46:35 EDT 2004

On Mon, 12 Jul 2004, Michael Loftis wrote:

> --On Monday, July 12, 2004 17:16 -0500 Michael Sims <michaels at> 
> wrote:
>> As promised, I'm following up to the list on the status of this problem,
>> in case anyone has an issue like this in the future.  It does appear to
>> have been caused by our intrusion detection device.  Our network manager
>> configured this device to avoid scanning POP3 connections and for the
>> past two weeks I have not seen any more pop3 daemons stuck in the middle
>> of a write().  I may be jinxing myself by saying that the problem is
>> resolved but it certainly appears to be so.
> write() to disk or network?  if network then sounds like a nasty deadlock in 
> the NIDS.  i never did like NIDS that required inserting themselves into the 
> traffic stream.

It was a write() to network.


Rob Siemborski * Andrew Systems Group * Cyert Hall 207 * 412-268-7456
Research Systems Programmer * /usr/contributed Gatekeeper

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