Service host process 5812 registered service type AXService
System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.
D'accord, un problème de certificate, mais lequel ? Dans ce cas-ci, c'est parce que le certificat de mon serveur ADFS était expiré.