Fix flakiness of tests on Windows requiring ports in the dynamic range

.github/workflows/build-and-test-windows.yml

@@ -69,6 +69,9 @@ jobs:
             ~\go\pkg\mod
             ~\AppData\Local\go-build
           key: go-build-cache-${{ runner.os }}-${{ matrix.group }}-go-${{ hashFiles('**/go.sum') }}
+      - name: Ensure required ports in the dynamic range are available
+        run: |
+          & ${{ github.workspace }}\.github\workflows\scripts\win-required-ports.ps1
       - name: Run Unit tests
         run: make -j2 gotest GROUP=${{ matrix.group }}
   windows-unittest:

.github/workflows/scripts/win-required-ports.ps1

@@ -0,0 +1,20 @@
+<#
+.SYNOPSIS
+    This script ensures that the ports required by the default configuration of the collector are available.
+.DESCRIPTION
+    Certain runs on GitHub Actions sometimes have ports required by the default configuration reserved by other
+    applications via the WinNAT service.
+#>
+
+#Requires -RunAsAdministrator
+
+netsh interface ip show excludedportrange protocol=tcp
+
+Stop-Service winnat
+
+# Only port in the dynamic range that is being, from time to time, reserved by other applications.
+netsh interface ip add excludedportrange protocol=tcp startport=55678 numberofports=2
+
+Start-Service winnat
+
+netsh interface ip show excludedportrange protocol=tcp