This reports where a specific TWAMP control session sits in the protocol's state machine, mirroring the test-session state machine but applying to the control connection itself rather than any individual test running under it. An admin seeing the control session stuck in an early state like greet, while its associated test sessions show as never having started, would know the root cause is at the control-channel negotiation layer rather than in the test traffic itself. For example, a control session stuck in greet typically means a shared-key or security-mode mismatch during the initial handshake is preventing any test sessions under it from ever starting.