Scenario: A Citrix Administrator is unable to connect to the XenServer hosts through XenCenter. Server and Desktop OS machines hosted in the XenServer resource pool are functioning as expected. What i

The pool master serves as the single management point for a XenServer resource pool, and XenCenter must connect through it to administer hosts. A pool master failure breaks the management plane entirely, explaining why XenCenter cannot connect while hosted VMs continue operating normally on slave hosts without interruption.

HA Heartbeat failure triggers automated VM restart or failover actions but does not prevent XenCenter from connecting to the pool master for management.

License Server failure affects Citrix product licensing and may restrict new session launches, but it does not block XenCenter connectivity to XenServer hosts.

A SAN failure would disrupt storage I/O and likely cause VM instability or outages, but the scenario states VMs are functioning normally, ruling this out.