If user authentication at TightGate-Pro is carried out via an Active Directory, the security certificate from TightGate-Pro must be trusted when logging in for the first time. This is necessary so that TightGate-Viewer can establish an encrypted connection to the TightGate-Pro server.
If you want to avoid the question about trusting the login appearing at the first login, you can store the root CA certificate centrally in the Windows certificate store. The following instructions describe the procedure.