Serial number blocked by firewall? How do I solve this?

When I use the server administration settings I get an error message saying the serial number could not be used because it's blocked by the firewall.
I know I'm using the right serial number.
Totally stumped.
Any ideas?
Version. 10.6.8

Is this a new Mac Mini Server system with a new serial number?
Is this Mac running as a guest in a virtualized configuration?
Has anytbody been working in the shell via Terminal.app in this system?
Does the Mac OS X Server firewall have the port open for port 626 under Firewall > Settings > Advanced?   (It's usually listed as rule 1.)
As a potential brute-force work-around: (re)download the 10.6.8 combo update kit, and apply it, and see if that clears this.
Better: if you just acquired this Mac Mini Server system (new), ring up Apple support and ask for assistance here.

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