If vCenter Single Sign-On fails to respond when logging in to the vSphere Web Client, there might be a problem with connectivity.

The vCenter Single Sign-On server shows the error Failed to communicate with the vCenter Single Sign On server <server-address>. The server might have failed to respond or responded in an unexpected way.

Connectivity to your vCenter Single Sign-On server is lost. The most common causes are that there is no connectivity to the Single Sign On server or that Single Sign On is not running.

1

The vCenter Single Sign-On server is working correctly, but there is no network connectivity to it.

2

The vCenter Single Sign-On server is not running.

1

Verify that the vCenter Single Sign-On server is working by checking the status of the vCenter Single Sign-On (Windows) and vmware-sso (Linux) services.

2

Restart vCenter Single Sign-On.