make sure that the client is set to obtain ip address automatically, and also that there are no other dhcp servers on the network

the client is set to obtain ip address auto, and there are no other dhcp servers

Do you have a firewall installed, like BlackIce Defender?
 
If so, it may be blocking the IP of your client. I had a similar problem.
 
Homer

for the 2nd netcard (go'n to the 2nd computa) i put in the ip address manually as 192.168.0.1 and subnetmask as 255.255.255.0 (defualt) and i put in the 2 dns servers my ISP uses same as my other net card (one go'n to my cable modem), so try that out if u got teh dns servers info for you isp good luck
 
------------------
=========================
ICQ me!!!
========Specs========
ASUS P3V4X
VARIOUS O/C SETTINGS
PIII 533 @ 640 133fsb
PIII 533 @ 584 150fsb
384mb PC133
20gIBM 7200 rpm
40g MAxtor 7200rpm
Sound Blaster LIVE!!! Platinum
ATI All-In-Wonder 128 32mb 2x Agp
19'Samsung SyncMaster 950p
Logitech Wireless keyboard/Mouse
Creative 52x cdrom
Richo CD-R/RW MP7040a 4/4/32
Epson Stylus colour 760
Cable modem
 
and i networked with a MAC G3, now sharing printer/hardrives and internet.
WOW, aren't i special now
 
AND iT ALL WORKS GRRRREAT!!!'

Shearing net on a modem What a waist.
Hehehe....
But anyway, enable the ICS on the connection that goes to the net, on you connection with the 2nd computer set ip to 192.168.0.1 and Subnet to 255.255.250.
On the computer you are connectiong to your server set the Gateway to 192.168.0.1 and DNS to the same as primary system and set to IP to auto or you can set manualy to 192.168.0.2 and Subnet to 255.255.255.0