Re: Cyrus 2.1.15 blocking connections after upgrade

From: Rob Siemborski (no email)
Date: Mon Feb 09 2004 - 09:58:24 EST


On Mon, 9 Feb 2004, Mike Brodbelt wrote:

> Some connections behave as expected, but some connections to port 143
> just hang. Using telnet to connect to the port shows that the TCP
> connection is established, but the Cyrus banner never appears, and
> eventually the connection times out. Once a connection has been
> established successfully, things seem to be OK. Restarting cyrus seems
> to make it easier to get connections, for a while. The Cyrus POP3 daemon
> does not appear to have this problem, but cyradm hangs before bringing
> up the password prompt.

Are you killing off unconnected imapd's recklessly or are you in a
severely resource-constrained enviornment? Both of these could lead to
master losing count of processes.

Note that the fact that master doesn't fork a new process does not
indicate a problem of its own.

> P.S. This looks like the /dev/random problem to me in many ways, but
> given the fact I've recompiled SASL, I can't see how it could be. Is
> there anything else that tries to use /dev/random directly?

You should do a truss of an imapd as it gets a connection -- this might
give you more insight into what is going on.

-Rob

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

---
Home Page: http://asg.web.cmu.edu/cyrus
Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html







Hosted Email Solutions

Invaluement Anti-Spam DNSBLs



Powered By FreeBSD   Powered By FreeBSD