Any time there is a GlobalCapture Engine living remote from the GlobalSearch server, a MongoXML file will be necessary to link the engine to the primary Mongo Database. This is most typically found in environments running multiple engines, but may also be found in an environment where a single engine is running on a dedicated capture server where the primary MongoDB exists for GlobalAction.
The MongoXML will go in the Capture Engine's directory and should point to the server address where Mongo lives.
The Mongo XML template is below. Be sure to use IP rather than machine name in your XML.
The Mongo Port does not need to be specified in the Mongo XML.