Solving the vSphere Web Client cannot connect to the vCenter Single Sign On server error.

After a power failure in my home lab, I tried to login to my vCenter Appliance and get this error “The vSphere Web Client cannot connect to the vCenter Single Sign On Server”.

The solution for this problem is quite simple. For the vCenter Appliance, log in to the Management page of the vCenter Appliance. Stop and Start the vSphere Web Client Services. 

For the Windows based vCenter, restart the vSphere Web Client Services.
After a few minutes everything is ok. Problem Solved.

** Edit 02-03-2016 **

Reboot of the vCenter Appliance should also solve the problem.

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The information in this article is provided “AS IS” with no warranties, and confers no rights. This article does not represent the thoughts, intentions, plans or strategies of my employer. It is solely my opinion.


Marco works for ViaData as a Senior Technical Consultant. He has over 15 years experience as a system engineer and consultant, specialized in virtualization. VMware VCP4, VCP5-DC & VCP5-DT. VMware vExpert 2013, 2014,2015 & 2016. Microsoft MCSE & MCITP Enterprise Administrator. Veeam VMSP, VMTSP & VMCE.


  1. Ramiro

    In our situation the solve was entering in management page, in SSO page, type a new password and clic on Test Setting. After that work fine.

  2. AJ

    thanks. had same situation & tried your suggestion and it’s work.

  3. Rafel

    Thanks. It worked for me !!

  4. Federico

    Thank you! I’ve resolved with this guide!!

  5. Terry Wilson

    Thats nuts and yes it works, why would putting in a new password and hitting test settings be the fix for this? Wow… crazy but it does work.

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