Prior to 8.2R3, Network Connect (NC), Windows Secure Application Manager (WSAM), and Windows Terminal Services (WTS) fail to initiate an TLS handshake with the PCS device if the device certificate installed on the Pulse Connect Secure server uses the ECC algorithm with ECDSA and ECDH cryptographic cipher suites. You may see the following error message with Windows Terminal Services (WTS):
Pulse Secure Terminal Services Client could not establish a
connection to Secure Gateway. Click OK to exit and retry. If the
problem persists, please contact your Administrator.