SRM MDM catalog items not checking back to EBP ("500 Internal Server Error")

Question

Hi All,
We are having an issue, ONLY with our PRODUCTION environment.
When we create a Shopping Cart and select items from an Internal catalogue, we cannot check the items back into SRM without the system throwing the "500 Internal Server Error" message. As the items never even reach SRM, there is nothing to check or display in the queues for anything even remotely helpful.
As mentioned above, the issue is only happening in our Production environment. We have tested using the production MDM webservice details in our PreProd environment and everything works flawlessly, so the issue very likely arises from our Production portal.
System info:
We have SRM 7.2; SRM MDM 3.0 and SAP Netweaver portal 7.1.
The users are using IE9 but the same happens on IE8 as well.
We have checked and all MDM applications are running.
We have done all the compatibility checks too given in https://scn.sap.com/thread/1075870  and https://scn.sap.com/thread/1836750 .
I have attached the logs.
Nothing helped so far, so we are hoping maybe either of you can.
Thanks in advance,
Niki

Answer 1

Hi Jason,
So in the end SAP gave a response that worked.
We actually had to delete the BYPASS_INB_HANDLER parameter and change our URL slightly. That helped and now the items check back in to EBP without issues.
The strange thing is that we still have that parameter in every other environment and yet it still works flawlessly, only causing issues in PROD. We are waiting on a response from them to ellaborate why... I am going to share when they respond.
Thank you for all the help!
Bests,
Niki