fcbb435a_ofessional_Growth__Leadership___Description
[Title] Programmatic Dual HTTP Callback Address [Category] Operations [Last Updated] 9/7/2006 [Description] 
When using the WSHttpDualBidning for callbacks, WCF will use by default port 80 for the callbacks. This will likely conflict during development time with local installation of IIS, and is of little use in Intranet deployment. Instead of using a config file to hard-code the callback port, you can use the IDesign's WsDualProxyHelper class to select any available port at run time, as shown in the download.
IDesign: Excellence. Professional Growth. Leadership.