Today the security certificate used by our VPN concentrator expired, and we have replaced that certificate with a new one. The certificate is used by the Cisco VPN Client to properly secure VPN connections, so clients with the old certificate will no longer be able to connect. You can get the new certificate by installing the latest version of our VPN Client at this URL:
http://sonic.net/support/hotspotportal/
-Jared and Kelsey