The services are still not in the services.ora file - I added the portals service manually, however as soon as I stopped and started the agent the entries were (as expected) overwritten.

I have noticed something else, in the navigator tree (where I can't see the database) I also can't see the listener associated with cream (the node) but I can see the listeners for the other 2 NT nodes that are discovered.

I discovered all my nodes through IP addresses rather than host names.

For reference I have added the contents of the listener.ora file.

Thanks again for sticking with this..

PORTALS =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = tcp)
(PROTOCOL = tcp)
(Host = )
(Port = 10001)
)
)

SID_LIST_PORTALS =
(SID_LIST =
(SID_DESC =
(SID_NAME = PORTALS)
(ORACLE_HOME = /opt/oracle920)
)
)

T01 =
(ADDRESS_LIST =
(ADDRESS =
(COMMUNITY = tcp)
(PROTOCOL = tcp)
(Host = 10.0.0.101)
(Port = 11001)
)
)

SID_LIST_T01 =
(SID_LIST =
(SID_DESC =
(SID_NAME = T01)
(ORACLE_HOME = /opt/oracle920)
)
)