One of our clients got this error message trying to run our ASP.NET web app (4.0) on a Windows 7 64-bit machine with IIS 7.5:
Same thing A listener channel for protocol 'http' in worker process '7416' serving application pool 'aa' reported a listener channel failure. The data field contains the error number.
The Event Log showed the above message, which meant that the application pool had shut down after receiving repeated errors. We just could not figure out what was causing this crash. After some time we noticed that the client had set Enabled 32-bit=true in his app pool settings. The moment we disabled the 32-bit (so that it worked as 64-bit), the error was gone!