Difficulty creating an IPA

I've created a provisioning profile as per:

http://docs.xamarin.com/guides/ios/deployment,_testing,_and_metrics/app_distribution_overview/ipa_support_for_ad_hoc_and_enterprise_deployment/

And although the solution builds and deploys to my iPhone device in DEBUG mode, when I select ADHOC, the build / deployment fails.

The last part of the output is as follows:

2>Target "_BuildNativeApplication" in file "C:\Program Files (x86)\MSBuild\Xamarin\iOS\Xamarin.MonoTouch.Common.targets" from project "mypath/myproj.csproj" (target "_RemoteBuild" depends on it): 2>Server command 'UploadChanges': failed to upload changes to the server 2>Command execution task ended with exception 2>Exception System.Net.WebException: The request was aborted: The operation has timed out. 2>Exception details can be found in the log file 2> 2> 2>Remote build step failed. 2>Done building target "_BuildNativeApplication" in project "myproj.csproj" -- FAILED. 2>Done building project "myproj.csproj" -- FAILED. 2>Build FAILED. ========== Build: 1 succeeded, 0 failed, 1 up-to-date, 0 skipped ========== ========== Deploy: 0 succeeded, 1 failed, 0 skipped ==========