I've got a Windows 2008R2 terminal server with ~30 users on it. It's joined to a Samba-based domain. During the login script, we connect directly to the LDAP server to pull out certain profile information. This used to work just fine. Now, it doesn't, but only for non-local-admin accounts. Local admins work fine.
As a non-local-admin:
Connection to ports 389 or 636 just terminate (wireshark on the LDAP server reveals no connection attempt)
Connection to other ports on the same server work fine
Same thing on multiple LDAP servers
Windows firewall is disabled
Can't find any other rules/policies that may block this
I suspect since this used to work, it came down during an update, but for the life of me, I can't find what.
EDIT: I just ran Wireshark on the machine and didn't see anything when connecting to the LDAP server in question (or any LDAP server for that matter).
I can, however, see traffic when I connect to that server on another port.