MN-610/MN-620 - new client can't get past router on wirele..

Archived from groups: microsoft.public.broadbandnet.hardware (More info?)

I'm having trouble getting a new wireless client hooked up to my
existing Microsoft MN-610/MN-620 setup. I have the wireless base
station hooked to a DSL modem, with one wireless client, and one wired
client, plus the new "problem" wireless client that can't connect.

My wireless client uses the Microsoft card. The wired client uses a
generic wired ethernet card. The whole shebang uses 128 bit WEP on the
wireless side, plus I use the MAC filtering feature in the base
station to allow only my own clients to connect/associate. Bottom
line, everything works as it should.

Now I want to add a new PC to the mix. I have a cheapo Xterasys
802.11b PCI card. Installed the drivers, dropped in the card, and put
in all my settings (same WEP key, channel, SSID, etc). I added the MAC
address of the new card to the base station setup.

The new client can see that the wireless network is there in its
"browser", and I can see from the base station log that it is allowed
to associate with the base station. In fact, according to the base
station config tool, my new client is even issued an IP address, I can
see its hostname, etc. So everything is working as it should, except
the new "problem" client can't get anywhere.

Can't ping the base station. Can't ping www.google.com. "ipconfig
/all" shows "cable disconnected" on the problem wireless card. Also
can't ping the new problem client from the known good wireless client.

Ideas?