Oracle Server remote connection fails

I am unable to create a monitor for Oracle Server form a remote location through Application Manager but there is no problem connecting to the same Oracle Server with SQLPLUS for the same remote location OR creating a monitor form the local network where Oracle Server is located.

Sample of the TNS file:
Test =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 22.155.47.246)(PORT = 1660))
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.10.20)(PORT = 1521))
)
(CONNECT_DATA =
(SID = Test)
)
(SOURCE_ROUTE = YES)
)

Is it possible to make such a remote connection, if yes how should I establish it ?

Thanks