Hi Ervin,
Yes, as per my understanding also the problem does not seem to be SAP related.
As I told, my colleague had been facing this issue and he's been given access to client network and frankly speaking I am not sure how the network team of my organization has configured that.
But as the issue has been resolved now after using the IP, we've gone ahead with our developments.
Thanks once again for the detailed analysis!!!
BR,
Anurag