We have a standalone 10.3/OES2SP2 server with CIFS configured. Nothing has changed with the configuration of this server, and yet as of mid-morning last week Windows 7 and XP are no longer able to connect. They are authenticating okay:

Jun 10 15:02:42 OES2BOX kernel: audit(1308008735.623:18913): user pid=1886 uid=0 auid=4294967295 msg='User : kat888 successfully authenticated: exe="/usr/sbin/cifsd" (hostname=?, addr=?, terminal=? res=success)'

Jun 10 15:02:42 ho10alx CIFS[1886]: INFO : CODIR: User : kat888 successfully authenticated
Jun 10 15:02:42 ho10alx CIFS[1886]: DEBUG: CODIR: SES New state: LoggedIn

But although authentication is successful and the logs show no errors, Windows itself is complaining 'ip_address is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions. The array bounds are invalid.

All I can find out from MS is that this is supposedly a problem with an RPC and 'not our fault'. Has anyone else encountered this problem?