Solution : https://service.sap.com/sap/support/notes/556734 (SAP Service marketplace login required)
Key words : 
directory /usr/sap/<sid>/sys/exe/run, bc 325- sap online library -> basis -> change, online/batch/batch input/direct input/, free background work processes, /3system -> check -> connection test, /3system -> check -> transport directory, - sap service marketplace, batch jobs rddimdp, direct tp calls, released event-dependently
Related Notes : 
       
| 556972 | FAQ OCS: Recommendations for error scenarios | 
| 556946 | Transport FAQ: TMS | 
| 556941 | Transport FAQ: Error scenarios | 
| 538268 | Log files with a 0 length in transport directory | 
| 536068 | tp clearold: Termination with long transport request names | 
| 330267 | Transports between Basis Releases 4.6* and 6.* | 
| 312843 | tp CHECK/CLEAROLD latest News | 
| 201199 | Cannot access file & | 
| 168175 | tp check/clearold problems | 
| 126776 | Transports between Releases 4.5 and 4.6 | 
| 120151 | Transports between Release 4.0 and 4.5 | 
| 117395 | Authorization problems for file I/O on Windows NT | 
| 62739 | Configuring a central transport host | 
| 60928 | Transports between Release 3.0 or 3.1 and Release 4.0 | 
| 45516 | tp error: no temporary protocol ... | 
| 41732 | Deletion of data in transport directory | 
| 28781 | Central transport directory NT/UNIX | 
| 26966 | Background jobs do not start when transporting | 
| 19466 | Downloading SAP kernel patches |