By default silverlight checks for cross domain policy on port 943. You can also change the SocketClientAccessPolicyProtocol property of the SocketAsyncEventArgs to check using HTTP on port 80.
I have an in-browser silverlight app and am in a situation where I have to force the policy check to be done using another port. Something above 1023.
Is there anyway I can force Silverlight to check for cross domain policy on a port different than the default?