E-Series, SANtricity and Related Plug-ins Discussions
modifying an old post from me this informations come from field. Documentation does not explain.
If you have to mirror two remote arrays using iSCSI two TCP ports must be opened between the iSCSI interfaces.
2463 over TCP - the same used by SANTricity Storage Manager on the management ports
3260 over TCP - the default iSCSI port