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Resolve network connection issues on a Windows 10 PC in LAN

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"

( [login to view URL] )

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.

Automatic bids will be dismissed.

Thanks.

Skills: Network Administration, System Admin, Local Area Networking, Network Engineering, Network Security

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( 95 reviews ) Tokyo, Japan

Project ID: #23965265