Remote Desktop Protocol

This forums post will provide you with the RDP port number used in a network with a firewall. It will also help you troubleshoot Remote Desktop Problems.

1. Find the Appropriate RDP Port Number
2. Firewall Issues
3. Step-by-Step Troubleshooting
4. For LAN Networks
5. For WAN Networks

What is RDP?

RDP is a windows terminal server protocol. if you have windows xp professional it already comes installed by default. also, windows 7 professional and ultimate have it installed. if you have windows xp, vista or seven or 8 home edition, it does not come with a RDP server, but it does come with a RDP client.

Port 3389

port 3389 is used for internal (LAN) - for example, you want to remote desktop from one internal computer (example: 192.168.1.100) to another internal computer (example 192.168.1.105)

Port 3390

Port 3390 is for external (WAN) connections - for example, you want to connect to a computer from the internet. example, lets say you are at work and you want to connect to your computer at home using the WAN IP address. then you need to be sure that you have port 3390 allowed either on your firewall or your router at home.

RDP Port Number

RDP (Remote Desktop Protocol) uses port number 3389 for LAN (Internal/Private) traffic and port 3390 for WAN (Internet/public) traffic. if you need to allow RDP into a firewall policy, then these are the ports you need to use for allowing DRP connections or for blocking.



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