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+# Document is empty
+`[error] Failed reading masterserver authentification response: encountered parse error 'The document is empty.'`
+
+The masterserver needs to request your gameserver for it to be authentified and registered.
+This error means that masterserver can't access your server's tcp port.
+
+It can come from many reasons
+
+### Your GameServer is out of date
+
+Check that your server is running on the latest Northstar release as it can sometimes include breaking changes.
+
+### Ports are not the same 
+
+Your gameserver is configured to listen to a given TCP port, masterserver needs to be able to contact your gameserver though that same port.
+
+If the masterserver can't access your gameserver through the same port
+
+### Windows Firewall is blocking tcp ports
+
+In some cases Windows Firewall can prevent your ports to be exposed to your local network.
+To fix this issue, make a rule to allow your server to listen on your network.
+Disabling the firewall can also work, even if it's not reccomended.
+
+### Router NAT configuration is incorrect
+
+If your port can be accessed from your local IP but not from your public IP, then it's very likely that your NAT rules aren't properly configured.
+
+
+
+### CGNAT
+
+
+### Mastserver is down
+
+Check Northstar's Discord for annoucements. if https://northstar.tf gives you a HTTP 523 error, that means that the masterserver is offline.