Check and firewall:
Window 7 Client
- netsh http add urlacl url=http://+:8090/ClientService/AppointmentNotification user=myUser or = users
XP
- httpcfg.exe set urlacl /u http://+:11715/service/ /a <http://+:11715/service/%20/a> D:(A;;GX;;;BU)
Refference:
http://msdn.microsoft.com/en-us/library/ms733768.aspx
