This issue mostly comes when we upgrade PSC ( appliances) , not able to open PSC in GUI mode.

 

This is certificate issue . there are 2 solution

1. Take snap shot and regenerate certificate then restart web-client service

2. Decommission affected PSC ( first check which PSC is pointing if you have 2 PSC) do not touch pointing PSC

3. Once Decomm delete it from disk and remove it from AD/DNS

4. Recreate DNS record

5. Deploy new PSC and join in Domain

6. Try IP/psc you should able to open it in GUI.

 

 

Using the cmsso command to unregister vCenter Server from Single Sign-On (2106736) | VMware KB