"Shared server: outbound transport protocol different from inbound"
*Cause: The protocol specified for an externally-identified outbound
connection from a shared server (database link) was not the same as
as that used for the inbound connection. It is not possible for
Oracle Net to authenticate a proxy connection that uses a protocol
that is different from that which was used for the connection to
the shared server.
*Action: Specify the same protocol in the Oracle Net connect descriptor
for the outbound connection as that used for the inbound