Vcenter server Windows failed to start CM

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We have a vcenter windows server 6.5 that suddenly stopped working and the web client fails with the following error


400] An error occurred while sending an authentication request to the vCenter Single Sign-On server – An error occurred when processing the metadata during vCenter Single Sign-On setup – Cannot connect to the VMware Component Manager


Rebooting the server didn’t help

The CM service does not start but could not identify the cause


any suggestion is appreciated

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