Symptoms

K2 Designer - "secure connection failed" error
 

Diagnoses

K2 Designer will not load get "Secure Connection Failed" error. It worked yesterday, and we're not aware of anything that changed. Configuration Analysis indicates everything is in working order (all "green").

K2 Server, K2 Studio, and K2 Designer for VS2013 all appear to be in good working order.

 

Resolution

The K2 self signed certs were expired. We went into IIS and generated new personal certificates and restarted IIS. All k2 sites are now working.