RS.exe results in "Client found response content type of '', but expected 'text/xml'."

Greetings. I have a project where I need to migrate reports from SharePoint SSRS to two different Native SSRS boxes (Native 1 and Native 2).

Both of the Natives are new boxes. The repository DB's reside locally. I personally did the install of SQL Server and SSRS recently. 

Using rx.exe, I can export the reports of one folder on the source to a folder w the same name to Native 1, but not to Native 2. Native 2 generates the message "Client found response content type of '', but expected 'text/xml'."

I've compared the configs between the two different destination servers and they appear the same with the exception of different links and the service account they're each using for SSRS to run. 

One important fun fact I should note is that on Native 1 in RS Config Manager I can click the link in Web Service URL and it opens as I'd expect. I try the same in Native 2 and get the message below. 

Also note that I have the same permissions on both boxes.

		<noscript><id id="moreInformation">More information</id></noscript> This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying. For more information about HTTP errors, see Help.

Thanks in advance! ChrisRDBA