Unable to use wi-fi on Ubuntu Hoary under WEP

[The_Eye_In_The_Sky]

Dear all,

I need your idea in solving my problem.

I have a laptop recently installed with Hoary with Prism I 802.11b card
(SharLan WL311F, Linksys WPC-11, and a noname brand PCMCIA).

There is no problem in getting the connection if I do not enable the WEP
64 bit. I cannot use the 128 bit since my old AP is the Silver one, able
to do 64 bit only.

If the WEP is enabled, with 5 letters case sensitive ASCII keys, or 10
digits hexadecimal number preceeded with 0x, the Wi-fi does not work.

>From iwconfig I can see that the card already got the AP's MAC address,
but the WEP simply does not work, thus I can only ping myself (if static
IP is used) or no network available (if DHCP is used).

Anybody has the same experience?

Many thanks in advance,

TEITS.