I know there are some weird issues with getting the dashboards to show up sometimes due to cookie issues but in my new setup I went to Settings in NPM then virtualization settings and set it up there and I didn't have any major issues. Also make sure if you changed the port it uses put that port in the integration section, I know it normally defaults to 443.
The IP Address that you are trying to integrate it to, that is the IP address of the virtual appliance of Virtualization Manager, correct? +1 to bhopkins, the integration piece wants to login with the https link of VMan on 443, and as far as I know, there isn't a way to change that in the DB.
Most issues with cookies and certificates can be found here:
If all your virtual resources are set up on both the Virtualization Manager and Orion side and you are still seeing this error, try restarting the Orion services.
Let us know if you need more help.