By sending heartbeat checks, the LoadMaster periodically ensures that each of the servers in a deployment is still running. As part of the heartbeat checks, on port 104 the LoadMaster opens a TCP connection to determine if the DICOM server on the Synapse server is still responding.

Note: The LoadMaster does not currently support DICOM Echo health checking.

The LoadMaster can also be configured to test the IIS service. The LoadMaster performs a check over HTTP to the web server. A particular URL to be reached is identified and a value (for example, DB-OK) set for LoadMaster to find. The LoadMaster calls the URL to determine if the database server is running successfully. If it is, the webpage returns a message containing the value. If not, an error message is returned. The LoadMaster can recognize this and looks for this value in every health check it performs.