named is up but does not respond to queries

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CentOS 4.1/bind-9.2.4-2.  

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

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:

        (from 192.168.1.150)
        $ host www.yahoo.com 192.168.1.21 
        ;; connection timed out; no servers could be reached
        
        # nmapfe of 192.168.1.21  (from 192.168.1.150)
        (The 1208 ports scanned but not shown below are in state:
        closed)
        PORT      STATE SERVICE
        22/tcp    open  ssh
        25/tcp    open  smtp
        53/tcp    open  domain
        
        (ssh'd into named server using IP# 192.168.1.21)
        # service named status  
        rndc: recv failed: operation canceled

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


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