I have installed a Godadddy certificate on an SBS 2003 system so that I can migrate to Exchange Online.
After a nightmare getting the certificate to install. I eventually succeeded (using Godaddy's instructions).
However I have discovered that VPN and Remote Web Workplace (can't connect to computers or server) no longer work.
To test I have created 2 VPN connections on the actual server to connect to its self. If I use the local IP address it works if I use the domain name or external IP address it doesn't connect.
VPN etc has been working for years. It only appears to have stopped when I installed this certificate.