runInstaller: [INS-06006] Passwordless SSH connectivity not set up between the following nodes

Hi ,

OS OEL 5.5 x86-64

current versions : R2.1.3 with DB 11.2.0.4

RAC nodes : db1 and db2

We installed EBS R12.1.1 and succesfully upgraded DB to 12.1.3 with  11.2.0.4 DB(without RAC) ,we planned to have RAC installation .

we are in beginning of 11g grid infrastructure installation .we are using grid user for this setup . when we run ./runInstaller we proceed to steps till ssh connectivity , in this when we click on test error is desplayed " runInstaller: [INS-06006] Passwordless SSH connectivity not set up between the following nodes"

even followed "11.2.0.4 runInstaller: [INS-06006] Passwordless SSH connectivity not set up between the following nodes(s) ( Doc ID 1597212.1