Can't remove port from excludedportrange

Question

I cannot remove port 80 from excludedportrange. Here's the complete list of exclusions (run in elevated cmd):

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

Protocol tcp Port Exclusion Ranges

Start Port    End Port
----------    --------
        80          80
      5985        5985
      8005        8005
     47001       47001
     50000       50059     *

* - Administered port exclusions.

When I try to remove port 80, I get:

C:\Users\CptBartender>netsh int ipv4 delete excludedportrange protocol=tcp 80 1
Access denied.

My guess is I don't have rights to modify the relevant part of the registry.

How can I remove port 80 from the exclusion list?

Running net stop winnat as recommended here did not help