On Sep 3, 2017, at 08:51 , MaverickNH <
[hidden email]> wrote:
> I'm using a GPSDO to set my PC Clock uisng ToyNTP
>
http://www.dxatlas.com/ToyNtp/ It keep time +/- 50 microseconds, which works
> great for digital work like WSJT-X.
>
> I have Network Time Protocol disabled in Administrative Services and I run
> ToyNPT as Administrator. It has worked fine for a year. Sometimes I get
> "SNTP Server: Unable to listen on Port 123" and reboot and it works OK.
> Just recently, something is grabbing that port, and won't let go. No new
> apps installed around the time the problem cropped up.
It’s possible that some piece of networking outside your computer (or a “helpful” update to your firewall) is blocking incoming UDP on port 123
>
> Is there any way to find out what app is using Port 123?
In the Windows world there might be some variability about how to do this, but, there is a nice summary of methods on StackOverflow at:
https://stackoverflow.com/questions/48198/how-can-you-find-out-which-process-is-listening-on-a-port-on-windowsOne of the suggestions in that summery is TCPView:
https://docs.microsoft.com/en-us/sysinternals/downloads/tcpview-Dale/KB1ZKD
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