I was thinking the same thing but just to be sure i created a test script to see for sure.
In the END it actually created more questions than answers.
let me know your thoughts.
running the curl test from my local server to UPS. it WORKS. I got returned data.
Running the exact same code on the server with the issue. INTERNAL SERVER ERROR
OK this absolutely looks like a server configuration issue right?
NEXT i tried changing the URL for the curl script to my dev server coding the php script to receive the XML and just spit it back to the sender.
Using this new URL on the affected server.. IT WORKS!? No ERROR and it is showing the XML on the screen returned from the remote script.
THIS is where I really lost it as i EXPECTED to see the same error.
What are your thoughts?