I have Fedora 5 with the latest Zimbra 4.5 Open Source Edition.
When I select Mail Queues this message pops up:
Server error encountered
message: system failure: exception during auth {Remote Manager:
usd218.org->
zimbra@usd218.org:22}
Error code: service.FALURE
Methode: ZmCsfe Command.prototype.invoke
Details: soap:Receiver