Vcenter Server missing in Web Client

I just upgraded my vcenter 4.1 installation to 5.1. The installation worked with no errors, but when i log into the web client, i get an error message telling me, that there could be made no connection to my vcenter server. The address the connection is tried to is

"https://my-domain.local:443/sdk"

so the connection string is missing the server name. It should be like "https://vcenter.my-domain.local:443/sdk". There must have something gone wrong with the vcenter server registration. How can i change this address to the right one ?

Thanks for the help