I have a small LAN and one of the PCs (Windows 10) started to behave weird after a Windows update.
Here it how it behaves:
- This PC can be seen on the network. If I ping it from other computers, it works.
- The shared folders on this PC can be accessed by other computers correctly.
- But programs on this PC that must respond to requests made by programs installed on other devices with access this PC in either ethernet or wifi by [IP:Port#] , now don't work anymore.
These programs used to work properly before and I think the change in behavior happened after a Windows update.
An example of such program is "Winpopup LAN Messenger"
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I checked the network advanced sharing settings and it's set like before (Turn on network discovery, Turn on file and printer sharing).
I disabled the firewall / windows defender.
With netstat -an command in cmd prompt I can see that those programs are listening to the UDP ports that they are supposed to listen to, however they don't respond to incoming requests from other machines.
I can give Teamviewer if needed.
Please bid only if you know how to troubleshoot the issue.
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