"some infrastructure servers cannot be contacted" error while connecting to NWDI track from NWDS 7.3 EHP1 SP05

Hi Experts,

I am getting "some infrastructure servers cannot be contacted" error while connecting to NWDI track from NWDS7.3 EHP1 SP05. But the same will work if i disable (unchecked) the proxy server in internet options->Connections->LAN settings->proxy server then close and open NWDS. Is there any proxy setting need to change in NWDS.

Regards,

Rakesh Mathew