Is port 3268 required?
TCP Port 3268 and 3269 are required for Global Catalog communication from clients to domain controllers. Global catalog servers help in finding an object in the Active Directory quickly.
What ports are needed for Active Directory?
Active Directory
| Client Ports | Server Port | Protocol |
|---|---|---|
| 1024-65535/TCP | 1723/TCP | PPTP |
What port is active directory on?
port 389 UDP
AD uses the following ports to support user and computer authentication, according to the Active Directory and Active Directory Domain Services Port Requirements article: SMB over IP (Microsoft-DS): port 445 TCP, UDP. Kerberos: port 88 TCP, UDP. LDAP: port 389 UDP.
Which ports are needed for Active Directory?
What ports are needed for Active Directory authentication?
2.2. 3.3 Network Requirements for Active Directory Authentication
- Port 53 for DNS lookups on Active Directory.
- Ports 88 and 464 for Kerberos authentication to a KDC.
- TCP port 389 for the secure LDAP connection to a domain controller.
- TCP port 3268 for the secure LDAP connection to a global catalog server.
Can I block port 389?
It is however possible for external parties to abuse the LDAP-service by performing a so called ‘reflection attack’. This is done via an UDP-connection on port 389. To prevent these sort of outgoing attacks you can block UDP connections on port 389 in your VPS’s firewall.
Which port does LDAP use?
LDAPS communication occurs over port TCP 636. LDAPS communication to a global catalog server occurs over TCP 3269. When connecting to ports 636 or 3269, SSL/TLS is negotiated before any LDAP traffic is exchanged.
When to use port 389 or port 636?
For LDAPs (LDAP SSL), TCP 636 is used for Directory, Replication, User and Computer Authentication, Group Policy, Trusts. Below are the discussion about the TCP and UDP port 389 and TCP port 636.
Why is my LDAP server not connecting on port 389?
Cannot connect to LDAP Server on port 389, 3268 and 636. This issue is the result of a non-default domain policy set in active directory that enforces all LDAP authentication to be secured with SSL.
Is there a way to block port 389 on ad?
As you mentioned, we could not block port 389 on AD. For LDAPs (LDAP SSL), TCP 636 is used for Directory, Replication, User and Computer Authentication, Group Policy, Trusts. Below are the discussion about the TCP and UDP port 389 and TCP port 636.
What can port 3268 be used for in LDAP?
Port 3268. This port is used for queries specifically targeted for the global catalog. LDAP requests sent to port 3268 can be used to search for objects in the entire forest. However, only the attributes marked for replication to the global catalog can be returned. For example, a user’s department could not be returned using port 3268…