Listen on v4 and v6

ISPChk/Properties/launchSettings.json

@@ -22,7 +22,7 @@
       "dotnetRunMessages": "true",
       "launchBrowser": true,
       "launchUrl": "/",
-      "applicationUrl": "http://0.0.0.0:4223",
+      "applicationUrl": "http://0.0.0.0:4223;http://[::]:4223",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
       }

ISPChk/appsettings.json

@@ -7,11 +7,11 @@
     }
   },
   "AllowedHosts": "*",
-  "Kestrel": {
+  /*"Kestrel": {
     "Endpoints": {
       "Http": {
         "Url": "http://0.0.0.0:4223"
       }
     }
-  }
+  }*/
 }