Why can't the hotel system get on?

First, there is something wrong with the intranet. Maybe there is something wrong with the intranet connection of this computer. Please check the intranet site.

Second: Check the server. Have you changed the IP address of this computer?

Third: anti-virus, it may be that this computer is used to access the external network, and the server is maliciously attacked, which makes it impossible to access the LAN.