Vsphere Replication unexpected error 400

hi guys,

I install VRM 5.1 on 2 server. First site is HP Proliant DL380 G8 server and the second site is Wearnes server.  After install and configure the VRM ova file, when try to add the remote site, the VRM showup an error "unexpected error:400"

Question :

- can we install the VRM on different hardware or server or the server must have the same brand/type ?

Thanks