Hello ..
I have the same problem to .. i use zentyal core 2.2.3, it works fine before, but after upgrade, i forgot which one, is it component or system update, i realize it after a few day when i try to access some files in server.
suddenly Zentyal server is missing from Network, it gives the same popup in linux client as aaron.jacobs,
in windows client, zentyal server is also gone.
but still can access using IP smb:// from nautilus in linux or \\ in explorer windows, password also working with this.
check zentyal.log .. found this
2011/11/20 06:40:40 ERROR> Ldap.pm:1103 EBox::Ldap::safeConnect - Couldn't connect to LDAP server ldapi://%2fvar%2frun%2fslapd%2fldapi, retrying
already try Marcus said in previous post, restarting file sharing service, no luck,
restart postgresql-8.4, no luck, restart zentyal or reboot the server still no luck.
I just used zentyal primarily for proxy, so i just realize it to late..
Any other suggestion ?
Regards