If an administrator has accidentally disabled all login authorities, no-one will be able to log in to Tarantella, even the UNIX root user. You can't run Array Manager or Object Manager from the command line because this requires an administrator to log in.
To solve this problem:
tarantella stop
.
tarantella config edit --login-unix-user 1 tarantella config edit --login-unix-group 1
tarantella start
.
The root user can now use Array Manager to turn on other login authorities as required.