ASA/OPA - Unable to RDP to Windows Server and Receiving "error: tls: bad certificate" when Trying to Connect
Sep 5, 2025
Advanced Server Access
Okta Classic Engine
Okta Identity Engine
Overview
When trying to RDP from a client with ScaleFT to Windows, the target server is unable to connect. The following error appears as a result:
INFO Background client: Display modal error: title=RDP URL error body=rpc error: code = Unavailable desc = connection error: desc = "error reading server preface: remote error: tls: bad certificate
Applies To
- Remote Desktop Protocol (RDP)
- ASA/OPA
- ScaleFT Client
- Windows Target Server running ScaleFT Server Agent
Cause
The time between the system and the target server was out of sync.
Solution
Synchronize clocks on the ScaleFT client and the Target server.
NOTE: It is recommended to utilize NTP in the environment to keep all servers' clocks in sync.
