The error: "Could not connect to the application server. Reason: Could not establish trust relationship for the SSL/TLS secure channel with authority"
Error received in version 16.7 when temporary certificate is used and web server is running on different machine than app server.Issue related to certificate.
When creating new web don't press Connect button and just proceed by skipping this step.
Deploy temporary certificate which was created on App server on web server. a) Export temporary certificate from App serverb) Import certificate under Trusted Root Certification Authorities in web server.