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Don Burleson Blog 







Oracle CMAN address tips

Oracle Database Tips by Donald BurlesonJuly 4, 2015

Question: (By Richard Jebb)  I'm still puzzled as to what to put where in the various .ora files when using CMAN (Oracle Connection Manager).  If I have a database named <db> running on a server named <server> which also has CMAN running on it listening on port 1522,

(1) what do I need in tnsnames.ora on the server and

(2) in tnsnames.ora on a client PC in order to ensure that I can connect from the PC to the server via Connection Manager?

For information (in case you need it), the tnsnames.ora on my server currently contains an entry for the CMAN listener as shown below:

# Connection Manager listener

The name cman_<server> is the same as that used to define the CMAN instance in cman.ora.

Again, in case it's important to consider, when I installed Oracle it configured the default listener on 1521 and this is currently running. Assuming port 1521 is open, I can therefore happily connect to a database <db> directly using an entry like

<db> =
(ADDRESS = (PROTOCOL = TCP)(HOST = <server>)(PORT = 1521))


Answer:  the key is to tell the client to route connection requests through the connection manager using an entry like this, with a double ADDRESS section:


Once I had set this up, I was in.



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