Run transaction RZ11, type in icm/host_name_full. The value of that parameter should be your FQDN.
Now back to the Exchange Profile as Iñaki Vila mentioned, set the following parameters
com.sap.aii.rwb.server.centralmonitoring.name = <the FQDN value you got from the above param>
com.sap.aii.rwb.server.centralmonitoring.httpport = 50000
Actually if you just leave your value as arvxidev that will do just fine but will possibly prompt for another logon (as SSO token will not be passed)