Attempting to connect to command center returns the error message "User xxxx is not allowed to login Command Center,".
For example:
This issue is caused by a user being defined to be authenticated as "Trust" and not using md5 or Password.
For example, in the above case, the connection to command center is edited for the "gpmon" user using the method below:
host gpperfmon gpmon ::1/128 trust
Change the authentication type to md5 or password. Reload the configuration using "gpstop -u" and try to connect again to command center using the "gpmon" user.