Added client to dhcp can't get lease line

[hadi57]

hi

i have something strange thing going on my dhcp server, i added a client's mac but he can't get a lease line when the "Deny unknown clients" is checked, when checking for his mac it wasn't found, like if it want aded and i am sure i did, so i tried to ad the mack again just to make sure, but i got the message: This Hostname, IP or MAC address already exists. the client can get the ip only if i remove the check mark and he looses the ip again when the maxium lease time is reached.

using the 1.0.1 jan 24 snapshot

help is apreciated

[hoba]

Anything in the dhcp systemlogs for this mac?