I can no longer create a server listening on port 64951 or 64952 under Windows 10

Question

I can no longer create a server listening on port 64951 or 64952 under Windows 10.

I got an exception on my C# program when I tried to bind to 0.0.0.0:64951.

Same on a C++/Qt program, the error is : 'the address is protected'.

In Tcpview I didn't find a process using these ports for listening on 0.0.0.0:64951 or 0.0.0.0:64952

what could be the explanation for this problem ?

Update :

C:\Users\>netsh int ipv4 show excludedportrange protocol=tcp

 

Protocole tcp Plages d'exclusion de ports

 

Port de début    Port de fin
-------------    -----------
      5357        5357
     49152       49251
     49252       49351
     50000       50059     *
     64916       65015
     65206       65305
     65306       65405
     65406       65505

 

* - Exclusions de ports administrés.

Answer 1

To fix this issue :

net stop winnat

net start winnat

When you run the command netsh int ipv4 show excludedportrange protocol=tcp You should have something like :

Protocole tcp Plages d'exclusion de ports

Port de début    Port de fin
-------------    -----------
      5357        5357
     50000       50059     *

* - Exclusions de ports administrés.