If a session dies very quickly, we assume there was a bug and we show the message: > Your session lasted less than 10 seconds. > If you did not log out yourself, it could mean that > there is some problem with your ThinLinc system. > Please contact your system administrator. However, since bug 7785, this message is no longer shown if the session dies very quickly. Instead, we get: > The connection was dropped by the server > before the session could be established. Which isn't as helpful. The cause is that we tried to add similar functionality to upstream TigerVNC, which isn't meshing well with our handling.
https://community.thinlinc.com/t/i-am-getting-error-on-thinlinc-client-the-connection-was-dropped-by-server-before-the-session-could-be-established/854