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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, but you can narrow them down using [Port scanning tools](#check-if-a-tcp-port-is-open).
+
+## If a scan on your external IP is successfull
+
+#### Your GameServer is out of date
+
+Check that your server is running on the latest Northstar release as it can sometimes include breaking changes.
+
+#### 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.
+
+#### 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 a scan on your external IP isn't successfull
+
+#### 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
+
+See [CGNAT](https://r2northstar.gitbook.io/r2northstar-wiki/hosting-a-server-with-northstar/prerequisites#cgnat)
+
+## Check if a tcp port is open
+
+To check if a tcp port is open, you can use online services like [canyouseeme](https://www.canyouseeme.org/) or use a command line tool.
+
+On Windows using Powershell the following command can detect if a port is accessible.
+
+`Test-NetConnection -ComputerName IP -Port PORT`
+
+Your server **must** be running while you scan the port.