Question
How can I verify that a target application is reachable over a Citrix virtual channel?
Answer
Register a no-op Interop method in the target application and invoke it at regular intervals. If the invocation succeeds, the application is reachable. If it fails, something in the communication path is preventing the call. That could be the Citrix connection, the target application not running, or another issue in the path.
From your application’s perspective, what matters is whether the target application is currently accessible - not which specific component in the stack has failed. This check tells you whether communication is currently possible without requiring direct access to the underlying Citrix channel.
Limitation
This is an application-level reachability check, not a protocol-level diagnostic for Citrix virtual channels. It does not identify the exact point of failure, but only whether the target application is currently accessible.