Solution : https://service.sap.com/sap/support/notes/1095272 (SAP Service marketplace login required)
Key words :
gw/so_keepalive instance profile parameter, instance profile parameter gw/so_keepalive = 1, existing gw-gw connections, smgw -> goto -> remote gateways, kernel patch corrects problem, deletes inactive tcp connections, gw/gw_disconnect parameter, smgw -> goto -> logged, internal firewall timeout, redundant tcp connections
Related Notes :
824722 | Gateway parameter: gw/local_addr |
743888 | GW: gw/so_keepalive profile parameter |