Open UDP port 123 on Windows Firewall (Network Time Protocol)

Dave Lawlor — Mon, 26 Mar 2007 03:57:02 +0000

On my internet time post there seems to be a lot of questions based on the firewall questions. Unfortunately I cant help every single person with every single different type of firewall. I will go through how to enable the Windows Firewall with explicit rules for inbound and outbound traffic that might help with others.

There are many ways to get this into the rules but here is the one I find easiest.

Go to the Start menu and type Security Center in the search box and start it up. Then in the left pane click Windows Firewall
On the Windows Firewall window in the left pane click Allow a program through Windows Firewall
You should now have the Windows Firewall Settings window up. Click on the Exceptions tab. At the bottom of that tab click the button Add port
In the Add a Port window fill out the information requested in this case it will be Internet Time Server, 123, and choose UDP for the protocol. Click Ok
That should be it! As you can see it will now be added to the list of exceptions, so we can click Ok
Hopefully this will help those of you that have been having troubles with the Internet Time Server portion of Vista.

As a added bonus here is a mini instruction to open the port for Mcafee Security Center I found: (No screenshots because I don’t use this product)

Configure -> Internet & Firewall -> Firewall Protection -> Advanced -> System Services -> Network Time Protocol Port 123

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Windows Server Training » Vista Firewall

Open UDP port 123 on Windows Firewall (Network Time Protocol)