Upgrading OpsCenter to different server

Currently we use OpsCenter 7.5 with NBU 7.5. OpsCenter runs on a W2K3 server and NBU on a W2K8 server.

We want to replace the W2K3 server for a W2K8. I prepped a new VM with W2K8, but when installing OpsCenter 7.5 i got errors and it didn't install. Found out that this is due to the IE version and that the solution is to install OpsCenter 7.6. That installed OK, but now i cannot get the NBU server to connect with the OpsCenter server. I use the command vssat --setuptrust <host>:1556 --securitylevel high, but get an error that it cannot connect to the OpsCenter server.

I can ping the OpsCenter server from the NBU server, DNS registration for both machines is ok. I'm doing something wrong but i cant figure out what.......