name & id looks up are suddenly failing

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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?


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