Hi,

We have a mail server and a file server. Folks use the same login information they use to access their email to access the file server. So the file server is using the same LDAP server as the mail server.

Today, at around 12 PM all of the sudden, the SSH connection to the mail server failed. The mail server itself was up and running just fine. At the same time, the file server became unavailable to the users. The file server is up and running and I can get to it via SSH just fine. Here's the log on the file server:

Code:
Jan 18 16:57:30 Fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 18 16:57:30 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com: Can't contact LDAP server
Jan 18 16:57:30 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com: Can't contact LDAP server
Jan 18 16:57:30 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com/: Can't contact LDAP server
Jan 18 16:57:30 Fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 18 16:57:45 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com: Can't contact LDAP server
Jan 18 16:57:45 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com: Can't contact LDAP server
Jan 18 16:57:45 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com/: Can't contact LDAP server
Jan 18 16:57:45 Fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 18 16:57:45 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com: Can't contact LDAP server
Jan 18 16:57:45 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com: Can't contact LDAP server
Jan 18 16:57:45 Fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://servername.domain.com/: Can't contact LDAP server
Jan 18 16:57:45 Fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 18 17:47:48 Fileserver restorecond: Will not restore a file with more than one hard link (/etc/resolv.conf) No such file or directory
Jan 18 15:31:45 Fileserver smbd[3943]: [2012/01/18 15:31:45, 0] services/services_db.c:svcctl_init_keys(420)
Jan 18 15:31:45 Fileserver smbd[3943]:   svcctl_init_keys: key lookup failed! (WERR_ACCESS_DENIED)
I am not at the console right now where the actual mail server is and as I mentioned above, the SSH to the box doesn't work anymore. Could it be the firewall issue or maybe the ldap failed?

When I try to ssh to the mail server, I get this error:

ssh: connect to host Mailserver port x: No route to host

I ping the mail server from the file server and it pings just fine:
Code:
[root@Fileserver ~]# ping mailserver
PING mailserver.domain.com (Mail Server IP address) 56(84) bytes of data.
64 bytes from mailservers.domain.com (Mail Server IP address): icmp_seq=1 ttl=63 time=0.680 ms
64 bytes from mailserver.domain.com (Mail Server IP address): icmp_seq=2 ttl=63 time=0.646 ms
64 bytes from mailserver.domain.com (Mail Server IP address): icmp_seq=3 ttl=63 time=0.633 ms
But telnet to mail server doesn't work:

Code:
[root@Fileserver ~]# telnet mailserver 389
Trying [Mail Server IP address]...
telnet: connect to address [Mail Server IP address]: No route to host
telnet: Unable to connect to remote host: No route to host
I know the mail server is up as folks can send/receive emails, but the box is not accessible via PuTTy or SSH from the file server. On the other hand, since the problem happened so suddenly and has always been working just fine, I think the firewall could be blocking SSH but I can't seem to find out why the LDAP server on the mail server cannot be accessed by the file server.

The file server keeps showing the errors below:

Code:
Jan 18 16:57:45 fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 18 17:47:48 fileserver restorecond: Will not restore a file with more than one hard link (/etc/resolv.conf) No such file or directory
Jan 18 19:22:16 fileserver restorecond: Will not restore a file with more than one hard link (/etc/resolv.conf) No such file or directory
Jan 18 19:56:06 fileserver restorecond: Will not restore a file with more than one hard link (/etc/resolv.conf) No such file or directory
Jan 19 07:30:13 fileserver avahi-daemon[3219]: Invalid query packet.
Jan 19 07:30:53 fileserver last message repeated 8 times
Jan 19 07:43:05 fileserver avahi-daemon[3219]: Invalid query packet.
Jan 19 07:43:45 fileserver last message repeated 7 times
Jan 19 07:59:36 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:36 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:36 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com/: Can't contact LDAP server
Jan 19 07:59:36 fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 19 07:59:36 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:36 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:36 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com/: Can't contact LDAP server
Jan 19 07:59:36 fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 19 07:59:39 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:39 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:39 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com/: Can't contact LDAP server
Jan 19 07:59:39 fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 19 07:59:43 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:43 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com: Can't contact LDAP server
Jan 19 07:59:43 fileserver nscd: nss_ldap: failed to bind to LDAP server ldap://mailserver.domain.com/: Can't contact LDAP server
Jan 19 07:59:43 fileserver nscd: nss_ldap: could not search LDAP server - Server is unavailable
Jan 19 09:48:11 fileserver smbd[7155]: [2012/01/19 09:48:11, 0] lib/smbldap.c:smbldap_connect_system(982)
Jan 19 09:48:11 fileserver smbd[7155]:   failed to bind to server ldap://mailserver.domain.com/ with dn="uid=zimbra,cn=admins,cn=zimbra" Error: Can't contact LDAP server
Can someone please shed some light on it please?

Thanks