This alarm message occurs if a radius server with port 1812 is mapped as an accounting server to the ESS-profile as shown below:
Radius server with port 1812:
Radius Accounting server on ESS profile:
Basically radius server uses UDP port 1812 for authentication and not for accounting.
Since radius accounting is mapped with an authentication port number, the alarm message is triggered.
Once the port of the radius server used for accounting is changed to port 1813, the alarm message disappears.
However, if the same server is used for radius authentication and accounting, then create two instance of radius server on the FortiWLC with the same IP address: one with the UDP port 1812 and the other with the UDP port 1813.
Then, map the first instance for the authentication and the other one for accounting respectively.
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