Solution : https://service.sap.com/sap/support/notes/618941 (SAP Service marketplace login required)
Key words :
symptom idocs suddenly display status, port type 'xml file', port type 'file', sap e0133 message, remote function call, started automatically' function, operating system command, tcp/ip connection, file interfaces, port <port_name>
Related Notes :
| 1140031 | Security Note: rfcexec/startrfc Used in File Interfaces |
| 618516 | Security-related enhancement of RFCEXEC program |