Connecting to another machine with MMC

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Any reason why my DC can't connect to a Member Server using Computer Management MMC ?

I used to be able to connect when the Member Server was just a w2k Pro machine, but not now.

Firewall (ZoneAlarm) config has NOT changed.

I can send a Console Message to the server, and all other connectivity is there - just not the "Connect to another Computer" capability

Thanks in advance