vSphere web Client says 500 SSO Error Null after reboot of vCenter Virtual Appliance.
Solution –
Once you are connected to your vCenter Server Appliance
check your log file hostname# cat  /var/log/vmware/vsphere-client/logs/vsphere-client-virgo.log
Reading the logs – The PSC and the VCSAÂ time was off by 20 minutes.
I configured the NTP and rebooted the vcsa and the psc and the web client came back to normal.
Satheshwaran Manoharan - Microsoft MVP - Award-winning Technology Leader with a wealth of experience running large teams and diversified industry exposure in cloud computing. From shipping lines to rolling stocks.In-depth expertise in driving cloud adoption strategies and modernizing systems to cloud native. Specialized in Microsoft Cloud, DevOps, and Microsoft 365 Stack and conducted numerous successful projects worldwide. Also, Acting as a Technical Advisor for various start-ups.
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thanks dear! fixed my issue as well. restarted my VMs before ntp server was powered up.