"HTTP/1.1 403 Forbidden" error from HTTPAPIR4

An app using HTTPAPIR4 runs without issue on multiple systems, including
systems delivered new from IBM.  It's a straightforward SOAP app--I deploy
the code and it works.

However, it's not working with a new customer's existing system--I get the
dreaded "HTTP/1.1 403 Forbidden" returned from HTTPAPIR4.  This Canadian
customer does not have other SOAP or REST apps running and they're very
security-conscious, so I suspect they've blocked themselves from getting
into the internet for port 80/443 calls.

Their system may not have a certificate--is the problem that simple?

And I told them this would be an easy install...thank you for your help!
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