Can't login to Web Client - Failed to connect to VMWare Lookup Service

[priceadvantage]

When I try to login to the Web Client with the root login, I get the attached error.  I'm not quite sure how to fix this.  Any ideas?

Also, when I try to install the Client Integration Plugin so I can use Windows session authentication, it appears to install but is still grayed out in IE 11 (if the browser makes a difference).

Thanks,
Greg

[bayupw]

Did you make any changes on vCenter Server's IP or hostname?

You might need to regenerate the certificate for vCenter Server after IP/hostname change.

Check these links:

http://www.virtual-blog.com/2012/09/failed-to-connect-to-vmware-lookup-service/

Failed to connect to VMware Lookup Service - SSL certificate verification failed

Re: VMware vsplere web client failed to connect to VMware Lookup Service https://<IP address>:7444/lookupservice/sdk

VMware KB:    Troubleshooting the vCenter Server Appliance with Single Sign-On login   

VMware KB:    Logging in using vSphere Web Client fails on a vCenter Server Appliance with the error...