ZyXEL Communications GS2210 Series - What May Go Wrong

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5.4.4 What May Go Wrong?
1 If the Switch does not allow access to users that submitted
the correct credentials, the following problems may have
occurred:
a. Usernames and passwords are case-sensitive. Make sure
that the user input the correct lower-case or upper-case
characters.
b. The RADIUS-server is unreachable. The Switch should be
able to ping the RADIUS-Server at all times. Make sure
network settings were configured correctly between
Switch and RADIUS-Server.
c. The shared secret between the Switch and RADIUS-Server
is not identical.