Solution : https://service.sap.com/sap/support/notes/550571 (SAP Service marketplace login required)
Key words : 
'connection test' -> 'version info' field -> trex 6, standard sap internet sales installation, sap internet sales support team, sap internet sales installation, prerequisites sap internet sales 3, post-installation test, sap internet sales 3, sap internet sales, trex installation directory, provide remote access
Related Notes : 
       
| 1094659 | Support for Internet Sales Release 4.0 | 
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| 747299 | EBP/CRM 3.0 SP Stack 06/2004 (SAPKU30019): Release&Info.Note | 
| 709921 | CRM 4.0 SP Stack 4/2004 (SAPKU40005): Release & Info. Note | 
| 562376 | Recommendations for IPC on UNIX operating systems | 
| 367665 | Entering ITS server in OSS for PCANYWHERE access | 
| 170102 | Automatic opening of a service connection | 
| 31515 | Service connections |