"Shared server: outbound protocol does not support proxies"
*Cause: The protocol specified to perform an externally-identified proxy
connection (database link) from a shared server does not support
*Action: Specify a protocol in the Oracle Net connect descriptor used for
the connection that does support externally-authenticated proxy
NOTE: Because of a limitation in Oracle Net, the protocol used for
the proxy connection must the same as that used for the
connection from the client to the server.