Solution : https://service.sap.com/sap/support/notes/754136 (SAP Service marketplace login required)
Key words :
terms connection pool j2ee application server resource adaptor reason, back-end system remain open, version >= sp2 patch 4 hotfix 5, connection pool property values, ep6 sp2 patch 4 hotfix 5, j2ee connection pool properties, j2ee connection pool, resource adaptor, ep6 sp2 p3, j2ee cluster installation
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| 745175 | Eisconnector's connection pool misbehave. |
| 739526 | EP 6.0 SP2 Patch 4 Hotfixes |