[Elecraft] [OT] ToyNTP GPSDO SNTP Server: Unable to listen on Port 123

[Dale Chayes]

On Sep 3, 2017, at 08:51 , MaverickNH <cbjesseeNH at comcast.net> 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-windows

One of the suggestions in that summery is TCPView:
https://docs.microsoft.com/en-us/sysinternals/downloads/tcpview

-Dale/KB1ZKD


> 
> Bret/N4SRN
> 
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