Webservice:the remote server returned an error: (+) Bad Request

Development tools: VS2010, Development components: WebService, operating Environment: Windows

Today, a colleague in the billing interface debugging, found a very strange problem: the interface in the home environment testing, everything is normal, but after deployment to the current network environment, successive calls to the interface will be error: The remote server returned an errors: (400) Bad Request, and then recycle the WebService own program pool, and then call again can, and then several successive calls, and the above problems arise.

He came to me to help check the problem, after understanding the whole process, I directly based on experience, set the program pool recycling policy, and then test, OK

Now the problem is solved, but the principle I have not yet thought to understand, have the understanding of the great God can share.

Webservice:the remote server returned an error: (+) Bad Request