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Your Dartmouth client (personal) certificate is not installed. You need an eToken or a software certificate.
You are using a software certificate that is not installed in the correct place (Windows requires the certificate to be installed in Internet Explorer; Mac OS X requires the certificate to be installed in the Keychain).
You are using the Windows operating system and are trying to use a personal software certificate that was issued by the "old" College Certificate Authority (a certificate obtained prior to August 23, 2007).
The wireless network management software your computer is using may not be configured correctly. Click on one of the links below to configure your machine.
You are using an eToken for your client (personal) certificate, but your computer is configured to look for a software certificate installed on your hard drive (or vice versa). Click on one of the links below to configure your machine.
Make sure you have followed the directions for configuring your computer: