Q:

What does Hessian in Security / Certificate / SSL Context mean?

I am getting an error message that hessian has an issue with active sync Connection.  What does hessian in an SSL-Certificate Context? Is it used for handshake? 

A:

Hessian is not an SSL concept. It is a web service protocol. You did not provide enough info, but my guess is your server certificate can't be validated on the client when connecting to the service.

