Could not connect to one or more vCenter Server systems: VCENTER APPLIANCE 5.5

Hi all,

I have installed with new v center appliance 5.5 in my lab environment.

i have connected with external  oracle db.

have enabled embedded SSO .

connected with windows AD.

in the configuration screen  .all the service status are running . ok

https://x.x.x.x:5480/

after loggin web client

https://x.x.x.x:9443/

GOT an  ERROR .

" Could not connect to one or more vCenter Server systems: "

https://x.x.x.x:443/sdk

Note:. I have reboot my vcenter appliance and try .....got same error.

          I have created new group in AD for vcenter and tried ..got same error.

While connecting with Vsphere client : got an error below.

"An unknow connection error occured ( this is failed because of a connection failure. (Unable to connect to the remote server )"

Please Help me on this.

Browlin