ASA: RDP Fails with Error "Connection closed before server preface received"
Sep 24, 2025
Advanced Server Access
Overview
RDP on client fails with error:
Connection closed before server preface received.
The issue happens for connections through Advanced Server Access (ASA) server agents.
Applies To
- Okta Advanced Server Access (ASA)
- Server agent
- Remote Desktop Protocol (RDP)
Cause
Solution
Correct the time or NTP server on the target server, followed by restarting of ScaleFT Server Tools service.
