iPhone Enterprise App Distribution - Internet Connection Required?

I am trying to distribute my Enterprise Application using the method described in the Apple documentation listed here: http://developer.apple.com/library/ios/#featuredarticles/FA_Wireless_Enterprise_App_Distribution/Introduction/Introduction.html

I am hitting the specially crafted itms-services URL, and it prompts me to install my application. If I say yes, the application icon appears and it says "Loading..." and it never finishes. I can hit my ipa file from the plist if I just bring up Safari and manually navigate to the URL. I checked the device log and saw the following errors:

Oct 8 16:28:08 unknown imagent[23] : [Warning] Async loading of bag failed: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x1ed337c0 {NSErrorFailingURLStringKey=http://init.ess.apple.com/WebObjects/VCInit.woa/wa/getBag?ix=1, NSErrorFaili开发者_StackOverflow中文版ngURLKey=http://init.ess.apple.com/WebObjects/VCInit.woa/wa/getBag?ix=1, NSLocalizedDescription=The request timed out., NSUnderlyingError=0x1ed32a00 "The request timed out."} Oct 8 16:28:08 unknown imagent[23] : [Warning] Bag loading failed! Error (NSURLErrorDomain:-1001): The request timed out. http://init.ess.apple.com/WebObjects/VCInit.woa/wa/getBag?ix=1

I'm not sure if it's related, but my iOS device is on a closed network with no Internet connectivity. Does anyone have any experience with this and know if the iOS device's inability to reach this URL could be what is making my app install hang in the "Loading..." stage?

Thanks for any help you can provide.

Yes, your device needs to have access to the internet. iOS reaches out to Apple to verify that your developer certificate and profile are valid.