What Is Port 135?

Port 135 is the RPC Endpoint Mapper service. It is a service that allows other systems to discover what services are advertised on a machine and what port to find them on. It is mostly associated with remote access and remote management.

Contents

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 close port 135?

Disabling TCP port 135 will NOT affect Local DCOM/Raw RPC server component because they do not need network. Disabling TCP port 135 will only affect some client machine which directly use DCOM remote activation (i.e. VB CreateObject(“Excel.

Is 135 UDP or TCP?

Port 135 Details

Port(s) Protocol Service
135 tcp,udp msrpc
135 tcp,udp loc-srv
135 tcp threat
135 tcp threat

What happens if I block port 135?

Blocking ports 135 and 445 has the effect of disabling SMB file-sharing on your Windows Server. If your boss is asking you to do this to “fix” the threat posed by WannaCry, then you should make your boss aware that this is the equivalent of deleting your e-mail address in order to avoid getting spam messages.

Why is port 135 open?

The SCM server running on the user’s computer opens port 135 and listens for incoming requests from clients wishing to locate the ports where DCOM services can be found on that machine.Port 135 is certainly not a port that needs to be, or should be, exposed to the Internet.

What is network port 137 used for?

Port 137 is utilized by NetBIOS Name service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet.

What is network port 135 used for?

Microsoft Windows Networking Services
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.

Can you turn off RPC?

Many Windows operating system procedures depend on the RPC service. Microsoft recommends that you don’t disable the RPC service.

How do I check if port 135 is open?

Using ‘netstat -ab’ to Identify Open Ports
Now, type “ netstat -ab ” without quotes, then press “Enter.” Wait for the results to load. Port names get listed next to each local IP address. Look for the port number you need, and if it says LISTENING in the State column, it means your port is open.

How do I open TCP port 135?

To open the DCOM port, follow these steps:

  1. Click “Start”, and then click “Control Panel”
  2. Double-click “Windows Firewall”, and then click the “Exceptions” tab.
  3. Click “Add Port”.
  4. In the “Name” box, type “DCOM_TCP135”, and then type “135” in the “Port number” box.
  5. Click “TCP”, and then click “OK”.
  6. Click “OK”.

What is port 135 TCP Msrpc?

TCP port 135 is the MSRPC endpoint mapper. You can bind to that port on a remote computer, anonymously, and either enumerate all the services (endpoints) available on that computer, or you can request what port a specific service is running on if you know what you’re looking for.

What ports does Kerberos use?

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

How do I stop listening to ports?

27 Answers

  1. Open up cmd.exe (note: you may need to run it as an administrator, but this isn’t always necessary), then run the below command: netstat -ano | findstr :<PORT> (Replace <PORT> with the port number you want, but keep the colon)
  2. Next, run the following command: taskkill /PID <PID> /F. (No colon this time)

How do I stop a port from listening?

How to kill the process currently using a port on localhost in…

  1. Run command-line as an Administrator. Then run the below mention command. netstat -ano | findstr : port number.
  2. Then you execute this command after identify the PID. taskkill /PID typeyourPIDhere /F.

How do I stop Windows port listening?

Windows

  1. Open a CMD window in Administrator mode by navigating to Start > Run > type cmd > right-click Command Prompt, then select Run as administrator.
  2. Use the netstat command lists all the active ports.
  3. To kill this process (the /f is force): taskkill /pid 18264 /f.

What is port for RDP?

port 3389
Remote Desktop Protocol (RDP) is a Microsoft proprietary protocol that enables remote connections to other computers, typically over TCP port 3389.

What is an RPC port?

The RPC Dynamic Port ranges are a range of ports utilized by Microsoft’s Remote Procedure Call (RPC) functionality. This port range varies by operating system. For Windows Server 2008 or greater, this port range is 49152 to 65535 and this entire port range must be open for RPC technology to work.

What is SMB port number?

SMB uses either IP port 139 or 445. Port 139: SMB originally ran on top of NetBIOS using port 139. NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network.Using TCP allows SMB to work over the internet.

What are ports 137 and 138 used for?

UDP ports 137 and 138 are used for local NetBIOS browser, naming, and lookup functions.

Is port 137 UDP or TCP?

GRC | Port Authority, for Internet Port 137. Description: UDP NetBIOS name query packets are sent to this port, usually of Windows machines but also of any other system running Samba (SMB), to ask the receiving machine to disclose and return its current set of NetBIOS names.