What ports need to be open for Kerberos?

What ports are required for Kerberos?

Ports 88 and 464 are the standard ports for Kerberos authentication.

What ports are required for domain authentication?

UDP Port 88 is required for authentication purposes. UDP Port 88 is used by clients and domain controllers to authenticate with each other. Both UDP and TCP Port 135 are required for communication between domain controllers and clients to domain controllers.

Is port 636 TCP or UDP?

Port 636 Details

Port(s) Protocol Service
636 tcp,udp
636 tcp,udp ldaps
636 tcp ldapssl
636 tcp,udp ldaps

What is port 135 commonly used for?

Port 135 is used for RPC client-server communication; ports 139 and 445 are used for authentication and file sharing. UDP ports 137 and 138 are used for local NetBIOS browser, naming, and lookup functions.

What ports are open on a domain controller?

UDP and TCP Port 135 for domain controllers-to-domain controller and client to domain controller operations. TCP Port 139 and UDP 138 for File Replication Service between domain controllers. UDP Port 389 for LDAP to handle normal queries from client computers to the domain controllers.

What is Kerberos port no?

Kerberos uses UDP port 88 by default.

Should I open port 135?

Port 135 exposes where DCOM services can be found on a machine. … Therefore, port 135 should not be exposed to the internet and must be blocked.

Should I open port 139?

If you are on Windows-based network that is running NetBios, it is perfectly normal to have port 139 open in order to facilitate that protocol. If you are not on a network using NetBios, there is no reason to have that port open.

How do I open port 3389 on my router?

Please log into the router website (generally at or and go into the 'Port Forwarding' section. Add a new 'Port Forwarding' rule for TCP port 3389 to be forwarded to the internal IP of your computer.

What ports need to be open for Remote Desktop?

Remote Desktop requires TCP port 3389 to be open. It is also possible to change the listening port for Remote Desktop on your computer. If you don't want to use 3389 externally, open a different port externally, but point it to 3389 on the IP address of the machine you want RDC on.

What port is Telnet?

The default port for Telnet client connections is 23; to change this default, enter a port number between 1024 and 32,767.

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