Solution : https://service.sap.com/sap/support/notes/216952 (SAP Service marketplace login required)
Key words : 
sapnet_rfc system number = 01 client = 001 user = oss_rfc password = cpic sapnet_rtcc client = 001 user = st14_rtcc password, /oss001withx1 = customer saprouter ip addressx2 = ip address, maximale anzahl von cpic-clients erreiched, matching interface found   -  bdl_get_ddic_info exception 2 wrong_function_parametera, 'maintenance -> remote environment -> custom target dest, sdcc -> maintenance-> remote environment -> default target destinations, service definition refresha regular service definition refresh, 'maintenance-> remote environment -> default target destination', st22 shows abap runtime errors ´rfc_no_authority´, sasm_<sessionnr>_coll_trans  jobs forone session
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