[CentOS] named is up but does not respond to queries

Wed Aug 24 15:34:29 UTC 2005
Arun K. Khan <knura at yahoo.com>

CentOS 4.1/bind-9.2.4-2.  

I have named serving as a cache DNS server plus SOA for a local intranet

The problem I am encountering - over a period of time it stops
responding to queries.  

nmap scan from a different host shows port 53 is visible.  I can telnet
to the port but all queries to server time out.  So much so that
"service named status" and "service named restart" hang.  I have to
manually kill the named process before I am able to start named again (I
do remove the lock/pid files manually as well).  This has occurred about
4 times since I installed CentOS 4.1 4 weeks ago.  I have not
encountered any problem with other services running on the same server.

I looked through /var/log/messages and did not find any errors logged by
named.  I'd appreciate any thoughts/suggestions to debug this problem.

Here is what I have tried so far to figure out the problem:

        $ host www.yahoo.com 
        ;; connection timed out; no servers could be reached
        # nmapfe of  (from
        (The 1208 ports scanned but not shown below are in state:
        22/tcp    open  ssh
        25/tcp    open  smtp
        53/tcp    open  domain
        (ssh'd into named server using IP#
        # service named status  
        rndc: recv failed: operation canceled

Arun Khan
Linux is like a wigwam - no gates, no windows, apache inside