Solution : https://service.sap.com/sap/support/notes/766807 (SAP Service marketplace login required)
Key words : 
rfcdispatch/rfclisten returns incorrect error code, abap short dump call_function_read_error occurs, external unicode rfc server terminates, remote function call area, potential memory leak repaired, error code rfc_conversion, runtime compressor error, table fields releases 6, rfc library reason, rfc library
Related Notes : 
       
| 766271 | External Unicode RFC server terminates with RFC_CONVERSION. | 
| 762861 | RfcListen/RfcDispatch returns RFC_FAILURE instead of RFC_CLO | 
| 754878 | RfcGetFunctionInfoAsTable does not fill all table fields | 
| 552646 | Sapshortcut: no Scripting, no Sessions in Saplogon menu |