Windows unable to find certificate for wireless network

[tcarp]

Some weeks ago I changed wireless routers and enable encryption on our
wireless network. The wireless network had been in place for years running
off a Linksys WRT54G. The new router is a D-Link DIR 255.

Right after the router swap and enabling encryption, one of the laptops on
the network started getting intermittent messages “Windows unable to find
certificate to log onto wireless network SSIDâ€. The other laptop doesn’t get
those messages. The message doesn’t seem to effect being able to access the
network.

In researching, it appears the most common cause has to do with enabling
IEEE 802.1x authentication. This has not been selected and, in fact, it’s
grayed out.

I’ve checked the differences between the two laptops. I don’t think it has
anything to do with the way they’re configured for encryption. One says
“WPA2-Personal†and TKIP (I understand that AES is the better setting;
something for the future). The other says “WPA-PSK†and I’ve tested with
both TKIP and AES.

WZC is started and I don’t see anything in the services list that looks like
the adapter utility (Intel Pro Set) is running. When I run the Intel Pro Set
utility from the control panel it also shows IEEE 802.1x disabled.

I will mention that the laptop that doesn't have the problem uses Intel to
configure the adapter.

Any ideas on where to look next?

Thanks

Tom

 

[Lem]

Some weeks ago I changed wireless routers and enable encryption on our
wireless network. The wireless network had been in place for years running
off a Linksys WRT54G. The new router is a D-Link DIR 255.

Right after the router swap and enabling encryption, one of the laptops on
the network started getting intermittent messages “Windows unable to find
certificate to log onto wireless network SSIDâ€. The other laptop doesn’t get
those messages. The message doesn’t seem to effect being able to access the
network.

In researching, it appears the most common cause has to do with enabling
IEEE 802.1x authentication. This has not been selected and, in fact, it’s
grayed out.

I’ve checked the differences between the two laptops. I don’t think it has
anything to do with the way they’re configured for encryption. One says
“WPA2-Personal†and TKIP (I understand that AES is the better setting;
something for the future). The other says “WPA-PSK†and I’ve tested with
both TKIP and AES.

WZC is started and I don’t see anything in the services list that looks like
the adapter utility (Intel Pro Set) is running. When I run the Intel Pro Set
utility from the control panel it also shows IEEE 802.1x disabled.

I will mention that the laptop that doesn't have the problem uses Intel to
configure the adapter.

Any ideas on where to look next?

Thanks

Tom

You've already eliminated most of the usual responses. Did you change
the SSID from the default to something uniquely yours? Check the list
of preferred networks to make sure that the problem laptop isn't trying
to connect to someone else's secured network.

The only other thing I can think of to suggest is to disable encryption
on the router; try connecting with the problem laptop; if it works,
re-enable encryption first on the router then on the laptop and try again.

--
Lem -- MS-MVP

To the moon and back with 2K words of RAM and 36K words of ROM.
http://en.wikipedia.org/wiki/Apollo_Guidance_Computer
http://history.nasa.gov/afj/compessay.htm