Can't add an ESXi 5.1 host to vcd 5.1.1 / ssl error

Hello,

when I try to add an ESX 5.1 host I get the attaced errormessages in vcd. All I found so far are hints to the SSL setting in vc under "vCenter Server Settings", but they don't exist anymore in vc 5.1.

Any idea?

__Leo