RDP connection invoked via KSC console uses hostname to connect to a host - mstsc.exe is invoked with /v hostname parameter. 

Edit command line used to invoke mstsc.exe with ip address parameter instead of the hostname:

1. Open Custom tools → Configure custom tools
2. Select Remote Desktop, click Modify

3. Edit Command line text box, it should contain <host_ip> instead of <A>:

   /v:<host_ip>:<P> /f

4. Disable Create tunnel for TCP port specified below checkbox

Administration Console will now launch mstsc.exe with ip address as argument.