name & id looks up are suddenly failing

[Aaron Bliss]

If seen this happen when there are dns problems.  You may want to check out
/etc/resolv.conf and ensure all is okay there.

Aaron

-----Original Message-----
From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]
On Behalf Of Ryan Golhar
Sent: Monday, March 30, 2009 3:45 PM
To: General Red Hat Linux discussion list
Subject: name & id looks up are suddenly failing

I have an LDAP system running on a RHEL 5 box for quite some time now 
without any problem.

Recently, anytime a user tries to log in they are unable to.  I managed 
to log in as root and try to do any command that requires looking up a 
username, and the system hangs.  Even doing an 'ls /home' hangs.

I've determined it has something to do with nss...if I remove ldap from 
nsswitch.conf, the system responds, but user ids are not translated to 
user names.

/var/log/messges doesn't show much, just:
Mar 30 15:43:38 sapphire ls: nss_ldap: could not search LDAP server - 
Server is unavailable
Mar 30 15:43:38 sapphire ls: nss_ldap: reconnecting to LDAP server 
(sleeping 4 seconds)...
Mar 30 15:43:42 sapphire ls: nss_ldap: reconnecting to LDAP server 
(sleeping 8 seconds)...
Mar 30 15:43:44 sapphire ls: nss_ldap: reconnecting to LDAP server 
(sleeping 16 seconds)...
Mar 30 15:44:00 sapphire ls: nss_ldap: reconnecting to LDAP server 
(sleeping 32 seconds)...


I haven't changed anything on this system and have no idea why this 
started.  Its a fully patched RHEL 5 box.  Any ideas where to start looking?