Unable to use SSL to secure communications with the agents and server.
On SBS 2008, Microsoft uses a website in IIS7 called "Web Applications" for all internet facing web applications, and the SSL certificate is bound to the sites directory, which AuthAnvil is not configured by default to support.
We have a blog entry with screenshots explaining the steps to accomplish this in detail at:
AuthAnvil 2FA v3.x
If you have any questions or need some help, we would be happy to assist. Open a case at kaseya.zendesk.com .