Hi Ricardo.
No, I have not yet found a resolution to my problem; it still persists. I have deleted and reconfigured SAML2 a number of times. I've noticed that if you reconfigure it, the ACS (assertion consumer service) and various other services appear using port 50000. However, if you restart the java stack and navigate back into NWA again to the SAML configuration, it then shows those same services as using port :80. VERY strange.
I have lodged an OSS incident with SAP Support for assistance, I will try to let you know the outcome; if you resolve it, I would appreciate the same.
Best,
Bryan
PS - I'm using Shibboleth as my IdP.