It looks like when we do a getwork request to MultiPool, they are also returning extra headers after the JSON string. I am not sure if they are checking user agent or what on their side. I have a work around so that the data makes it into the work_data table. Now, it still looks like it has a problem submitting the data. I will look into this later in the day (Saturday), after I get some sleep. I'm thinking it is going to be along the same lines, where as, after we submit the work, MultiPool returns JSON + headers.

EDIT: I have a workable solution. I was able to successfully submit work with the proxy to MultiPool.

I will discuss the fix further with cdhowie in the morning and see how he wants to go about implementing it.