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

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

MaverickNH
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.

Is there any way to find out what app is using Port 123?

Bret/N4SRN



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

Dale Chayes

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

NK7Z
In reply to this post by MaverickNH
More than likely your existing NTP client in Windows has arisen from the
dead like a zombie, and is starting up at boot time.

73s and thanks,
Dave
NK7Z
http://www.nk7z.net

On 09/03/2017 05:51 AM, MaverickNH wrote:
> No new apps installed...
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Re: [OT] ToyNTP GPSDO SNTP Server: Unable to listen on Port 123

MaverickNH
That TCPView is a nice app - it helped me confirm that the Win10 NTP client
was indeed coming back from the dead - not showing in Task Manager Processes
but listening on ntp Port 123. Ending Process with TCPView seems more
effective. Bullet to the head for those Zombie Apps!

Thanks guys!

Bret/N4SRN



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

Clay Autery-2
In reply to this post by NK7Z
What Dave said!!!  Windows is notorious for things similar to this.

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Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 9/3/2017 8:48 AM, Dave Cole wrote:

> More than likely your existing NTP client in Windows has arisen from
> the dead like a zombie, and is starting up at boot time.
>
> 73s and thanks,
> Dave
> NK7Z
> http://www.nk7z.net
>
> On 09/03/2017 05:51 AM, MaverickNH wrote:
>> No new apps installed...
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