A firewall effectively prevents access to your server that is not allowed. It is all the more critical when the wrong ports are accidently opened. Assailants can then exploit security holes in the server and can in this way have access to your server.
With our Port Scan Monitor we regularly check your server for unintentionally open ports. You configure which ports can be opened. If we determine that another port is externally accessible, you will be notified.
In this way server monitoring ensures that security holes in your firewall do not remain concealed.