Two different ibooks, both run 10.3.9

Neither can connect to router wirelessly.

One network is on a Dlink router, the other is on a netopia-supplied by AT&T.

The dlink DIR625 is set up for WEP 64 hex, the netopia is set for 128 hex.

Firmware version 9.52

Both give same error. "There was an error"

Using Airport setup assistant,Set up your computer to join an existing airport network it see the network, but says the password is incorrect. I've tried it using all caps, no caps, starting with $, standing on my head

It's gotta be the cards?

Both will connect wired.

Should have added, both used to work, the ibook 500 as recently as a week ago, but there was a security update applied

Security update 2004-10-27 installed 8-22-09

and it was installed wirelessly

Reset both the devices (the dink and the At&t) Check the manuals on how to do this. It usually involves inserting the end of a paper clip into a smal hole in the back of the device. Let us know what happens
Richard

All great truths begin as blasphemies. GBS

iMac 1.25 GHz G4 20 inch display, 1Gig RAM, Airport Extreme card, Superdrive, 150 Gig HD, OSX 10.5.7. Maxtor 150 Gig FW drive (bootable with 10.5.7, Maxtor 500 Gig USB HD, Epson CX5000. Apple aluminum KB and Logitech "wireless" mouse. Airport Extreme (.g) Base Station connected to Arris Touchstone cable telephony modem. Comcast Cable Broadband with Comcast digital volce.
Intel MacBook 1G RAM and 2GHz Intel Core 2 Duo, 74.5 Gig Hard Drive and Iomega 500 GB FW HD. OSX 10.5.7. Networked using Airport Extreme (.g) with above iMac.

tried reset, hasn't changed,

Do you have any other computers that are still connecting wirelessly? If not, maybe it's the router??? I had one die recently.

6 other computers connect wirelessly to the Netopia and 3 other to the dlink. All the above have either g or n cards.

So b is dead? with newer routers? I ask because of a recent call with an older laptop of a friend. It's a HP and only is capable of WEP, the router at her home was set for WPA, and it appeared to be knocking the other new HP off the network. However her hubby's MB didn't have a problem-one switcher credit to me-make that a half, their son pushed the switch too.

The 802.11 g standard is fully backward compatible with 802.11 b however, an 802.11 b only device on an 802.11 g network will slow the entire network down to 802.11 b speeds . But, since the 802.11n protocol standard and the associated 802.11b/g compatibility mode has not been finalized it is entirely possible that a base station running 802.11n with 802.11b/g compatibility mode may have connectivity issues with other 802.11 n devices much less the older 802.11 b devices.

As for the security protocols, more recent model base stations configured for 802.11 b/g will usually support either WEP or WPA/WPA 2 but not both simultaneously. Of course WPA/WPA 2 is preferred.

Have found a solution.

I can connect if 802.11n is not enabled on the router. Mixed b and g works, b only works, but as soon as I enable any flavor of n, the ibook can not connect.

isn't there an option there somewhere to allow/deny mixed networks?

Its not so much allow/deny as what do you enable on the wireless router.