After the NAT server based on the IP address and port number is configured, the mapping takes ineffective

After the NAT server is configured based on the IP address and port number, the mapping takes ineffective. Perform the following operations to locate the fault:

1. Access the internal server to determine whether the internal server can communicate.
2. Check whether there are reachable routes between the device configured with the NAT server and the external host and internal server.
3. Check whether the NAT server configuration is correct.
4. Check whether the mapped external port number is available, and replace the external port to check whether the internal server can be accessed.
5. Run the display nat session command on the device configured with the NAT server to check whether there are entries before and after mapping. Obtain packets and check whether addresses in packets for access of external users are translated on the device configured with the NAT server.

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