If you have a FortiGate model that is FortiExplorer enabled and on FortiOS 4.3, please be aware that if you define trusted hosts for an administrator, please ensure that you add 127.0.0.1/32 to the list of trusted hosts for any applicable admins. If you don' t do this they will be rejected when they try to access the FGT over FortiExplorer.
In version 5.0 GA and above this was changed to be enabled without requiring config, so if you are on this version or above you are already taken care of.
Cheers!
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Sean Toomey, CISSP FCNSP
Consulting Security Engineer (CSE)
FORTINET— High Performance Network Security