After NAT is performed on the server where the Windows XP operating system (OS)is installed, the public network can access the server. However, the OS of the server is now changed to the Windows 2003 OS, the public network can access the server after NAT.
Ping the server with the source IP address (public IP address) from the firewall. The server cannot be pinged through.
Check whether the gateway is correctly configured on the server.
It is discovered that the gateway of the server is 192.168.1.253.
Change the gateway to 192.168.1.254. The problem is solved.
The gateway of the customer's server is incorrectly configured.
Note: Check whether the connectivity is normal first. Pay attention to details to avoid silly mistakes.