Windows 10: Why is NTP client using local UDP port 123 - fails to sync time

Hello,


My Windows 10 installation fails to sync network time.


It looks like the windows SNTP client uses UDP port 123 for both source and destination and my ISP is blocking local port 123 in all likelihood.


NTP updates work on linux distros and I also tried a tool called "NetTime" on Win10 which works because the source port is a random unprivileged port in the 60,000 range.

I am posting here to make a request to change the behaviour of Win10 NTP client to use a random higher port unprivileged so people do not face this issue - I have seen umpteen complaints online of people not being able to sync network time on Windows.


Thank you.

:)

 

What's up with time syncing on Win 8.1 !?

There were lots of DDoS attacks on the udp port 123 (Network Time Protocol) recently ... yes, DDoS targeted time servers specifically ... Technical Details Behind a 400Gbps NTP Amplification DDoS Attack

 

UDP Ports

Windows 10 appears to be a totally control-freak operating system and I'm hating it.

I'm trying to run a TeamSpeak 3 server on my computer. It uses UDP Port 9987. I can access the port locally, through localhost or 127.0.0.1, even my internal IP... 192.168.1.116. But the instant I try to access it from the internet, it fails to connect.
Yes, the port is forwarded in my router's port forwarding. Every program that uses TCP ports works just fine. But UDP ports are being blocked by something and I can't figure out what is blocking it. So, logically, since I don't have anything but the router,
windows firewall and windows defender, it MUST be windows. I've checked for proxies between the internet and my router and there are none. So, again, logically, the only option left is Windows 10 itself.

I use to be able to use UDP ports in Windows 7 and Windows 8. It stopped when I upgraded to 8.1 and then 10 it still doesn't work. Does anyone have any suggestiongs?

I have a local portforward checking application that pings a external server that then tries to connect using the specified protocol for the specified port and it works just fine on TCP 9987, but when I tell it to check UDP 9987, it immediately comes back
stating that a program is blocking the UDP 9987. Does anyone have any suggestions? Please, somebody help me get this working. I'm pulling my hair out here.

 

NTP Help

Hi guys, I know this is not the site for bull**** networking but you've been the most reliable tech site I've ever been on for any computer stuff. So I've got a question about a network. I'm with the Marines, and we're running secure networks branching off from everywhere. I mean I'm in Japan right now. But we're trying to sync our hardware (Cisco devices, switches and routers) to NTP. I created a test setup with a router, easy as pie to sync that, but it was a direct connection from the router to our linksys gateway directly to the ISP. But in the real setup, we pull NTP data on every piece of hardware I set up to sync...we just don't sync. "Show NTP associations" shows full reach, stratum 3 servers all working perfect but our offsets are off (I'd love to know what the numbers for offset mean), but show ntp status shows no synchronization, not even a hint that it realizes it's got a working NTP server to pull off of. NTP is supposed to be an easy setup, but for over a month now myself and everyone I know have tried everything from our end to get a sync and we got nothing. Maybe it's not close enough to the NTP time, so we set the time and timezone a billion times, nothing there. I'm assuming since we can pull data from NTP servers, the port's gotta be open right? If it's impossible to sync because somewhere along the way a firewall is blocking it's UDP port, that's totally cool, then I'll have an excuse as to why we're gonna have to manually set clocks. But the fact that it pulls information (diagnostics at least, ping, offset, freq, stratum) I feel like we should be able to pull time, we just can't for some reason. If you guys have any idea what I can do please let me know. Thank you