Ultra Pipeline URL Can't Be Reached; Request Times Out

I have created a pipeline that runs while using a triggered task but when I re-create the same pipeline but with using an ultra task I am unable to reach the HTTP endpoint due to timeout.

My pipeline starts with an XML formatter, as the content of my request is an http post content-type = application/xml. I have added the content type and authorization header to my post request which I am sending via Advanced Rest Client (this all works when using triggered task).

The pipeline execution statistics also show that the ultra task is listening but I am unable to reach it via the advanced rest client. Screenshot of my pipeline is posted below. Any help is greatly appreciated.

Thanks,
Chris