HTTP Bad Request (400) Error with a WCF Service with Multiple Endpoints?

Can you try to inspect the request being sent to the server using tools like Fiddler. There must be something in the soap envelop that is causing the issue.

Can you try to inspect the request being sent to the server using tools like Fiddler. There must be something in the soap envelop that is causing the issue. Also try to send small data initially to make sure your service is accessible and then try to larger data so that you can narrow down on where the problem is.

Have you implemented the async pattern or is your web service marked as Async=True. Would be helpful if you can post your service as well.

As it turns out, this issue was caused not by the contract object but by an object it REFERENCED not being found. In my case, I had forgot to install all of the required Microsoft Sync Framework pieces on the server. I guess the moral of the story is that this error is pretty misleading and applies to all child objects as well!

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