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Up to and including LCOS FX 10.4 the first administrator logged on is automatically logged off if another administrator logs on. It does not matter whether the same administrator account or different accounts are used.
As of LCOS FX 10.5 multiple administrator administrators can log on simultaneously to the Unified Firewall. Only the first administrator has write access though, the other administrators only have read access. If the first administrator logs off, the write access is passed on to the next administrator.
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