General Reference - Network
This page stands as a quick reference to the basic requirements of and general technical information on Instana.
By default, the Instana Host agent listens on all private IP addresses using port
42699. This can be overridden via configuration or environment variables.
However, the fact that the agent is reachable on port 42699 is not sufficient to ensure that all applications can be traced. For language-specific port requirements, consult the Network requirements documentation.
For supported languages where Instana offers language specific sensors, the sensors will, by default, search the
localhost and default gateway on port
42699 for a running instance of the Instana Host Agent