Hi Christian,
Check the dev_ms file in the usr/sap/<SID>/SCS<nr>/work directory. This will have the http port, for example:
[Thr 6884] set HTTP state to LISTEN [Thr 6884] *** HTTP port 8101 state LISTEN *** [Thr 6884] MsHttpOwnDomain: own domain[1] = wdf.sap.corp [Thr 6884] *** I listen to internal port 3901 (3901) *** [Thr 6884] *** HTTP port 8101 state LISTEN *** [Thr 6884] CUSTOMER KEY: >G0508331440< In this case the port is 8101 regards, Hemanth