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

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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.

Other related questions:
How to locate the mapping failure problem after the NAT server based on the IP address and port number is configured on an AR
After the NAT server based on IP address + port number mapping, the mapping fails. Use the following method: 1. Check whether the internal network server can be accessed. You can access the internal server through the intranet. 2. Check whether there are reachable routes from the external host and internal server to the NAT server. 3. Check whether the NAT server is correctly configured. 4. Check whether the mapped external port number is available. Replace the external port to determine whether you can access the internal server. 5. Run the display nat session command on the NAT server to check whether there are entries before and after mapping, and obtain packets to check whether the NAT server translates the address of data packets of external user access.

How to configure port mapping on an AR that acts as a twice NAT server
For details about how to configure port mapping of twice NAT server on an AR, see "Internet Access > NAT > Example for Configuring NAT to Connect Intranet Users to the Internet, Provide the Web Server, and Enable Intranet Users to Access an Internal Web Server Using Domain Names" in the Typical Configuration Examples.

Whether the USG2000 series can map ports after the nat server command is executed
USG2000 series cannot map ports after the nat server command is executed.

Whether the public IP address mapped to the USG5530 must be configured for the external network port or NAT address pool
You only need to configure NAT Server for the mapping instead of configuring the public IP address for the external network port or NAT address pool.

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