I was also facing the same issue. I also thought that issue was Firewall or Antivirus restriction. But after investigtaion I found that... Mine issue was system running using IPV6 in place of IPV4 and system was recognizing [::1] in place of 127.0.0.1, so made an entry in system (using Admin priviledge) netsh http add urlacl url=http://[::1]:47873/help/ sddl=D:(A;;GX;;;WD) Check the forum http://social.technet.microsoft.com/wiki/contents/articles/3711.aspx for the reference. Hope it might be of some help.