3.x to 4.3 upgrade is little longer road...
It would be: 3.x to 4.0. Then 4.0 to 4.3.
`ou=configuration,inum=@!88EC.EB99.B507.02F7!0002!1DE7.F87A,ou=appliances,o=gluu` --> in 4.x... entry ( including parent entry ) has changed to `ou=configuration,ou=appliances,o=gluu` type.