- When a Collector connects to the APM DB, it provides its FQDN, port number and a list of IP addresses for all bound Network Interface Cards (NICs) on which it is accepting incoming communications.
- The Collector IP Address or hostname set in the MOM IntroscopeEnterpriseManager.properties file must match or be resolvable to the Collector FQDN in CEM. If there is no match the Collector status is set to "Unknown" instead of "Up"
The CA APM cluster failover environment had the following configuration:
- A Collector registers its FQDN and NIC IP Addresses with the APM DB and can be successfully used for assigning CEM Services.
- A MOM is using a Collector Virtual IP Address (VIP) and can successfully connect to it.
An "Unknown" running state will be reported instead of "Up" because the MOM is not able to map the Collector FQDN in CEM to the Collector VIP that it is configured with.
That also causes the Automatic Transaction Discovery (ATD) failure: "No matching EM collector found for <FQDN of EM running Tim Collection Service>".