[Pdns-users] Possible tcp listener issue

[bert hubert]

On Tue, May 04, 2010 at 05:04:51PM +0100, Simon Bedford wrote:

> >We created a patched version in the end and rolled to one server
> >back on the 8th April, no fault seen since and now rolled to the
> >entire platform as of today, looking good.
> 
> We have now had 2 more failures of the tcp listener on 2 seperate
> servers in the last week, a simple reload of the software fixes

So this is with the patched servers?

> this. the thing I have noticed when this occurs is that when
> telnetting to the port you can then type in anything and try and
> escape, etc but the connection never closes, whereas on a working
> server the session will close after a short while of typing and
> pressing Enter.
> 
> The logs do not show anything or give any pointers as to the cause...

Please remind us of your operating system, RHEL4 I think? Or 5? Is there
anything special about your workload? Residential internet connections I
think? 

How many TCP/IP queries do you see per second, roughly? A quick run of
rec_control should dig this up.

	Bert