Solution : https://service.sap.com/sap/support/notes/457115 (SAP Service marketplace login required)
Key words : 
ixos web page 'sap upgrades, /esc/cgi-bin/index, ixos expert service centerunder, terms ixos-archive, sap reason, ixos-archive, cgi/1052982534-895orcontact, ixos-econtext, ixos support, support@ixos
Related Notes : 
       
| 435140 | Additional information on upgrading to Basis 4.6D (APO 3.1x | 
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| 401717 | Additional info on upgrading to SAP Web AS 6.10 (Basis) | 
| 390062 | Additional information about upgrading to 4.6C SR2 | 
| 335029 | Additions to the upgrade to Basis 4.6D (NDI Upgrade) | 
| 329622 | Additions: Upgrading to Basis 4.6C SR1 (NDI upgrade) | 
| 327285 | Additions to upgrade to 4.6C SR1 | 
| 315377 | Additional information about upgrading to 3.1I SR1 |