Did you follow the steps in my first answer? ie. Go into Control panel / Certificate manager / Authorities tab.... Select the cert and choose Trust, then check the WLAN box. Worked for me on N800 / OS2007. Peter Flynn wrote: > technut wrote: >> You get the "can't find a certificate to validate the server" error >> message if you either don't have the matching root cert, or if it >> isn't enabled for WLAN connections. >> >> If you can figure out which CA your Radius server certificate is from >> (eg. Entrust? Verisign? ask the Radius admin guys), then go into >> Control panel / Certificate manager / Authorities tab and you'll >> probably see the root certificate that matches the Radius cert. >> Select it and choose Trust, then check the WLAN box. > > As it's a private network, we are our own CA, so I got a copy of the > root cert from our network guys (with a little persuasion). > > I installed it through Tools | Control Panel | Certificate Manager | > Authorities | Import, without any problems. > > But when I connect to the network, it still says it has no CA > certificate to validate the server. Is there some other box needs > checking? > > ///Peter >