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I have RMAN backups failing, I am receiving the error msg:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-04004: error from recovery catalog database: ORA-12170: TNS:Connect timeout occurred
I spoke to Metalink and they stated that we should add the following parameters to our sqlnet.ora file.

Here are the parameters they wanted me to add:
SQLNET.INBOUND_CONNECT_TIMEOUT
SQLNET.SEND_TIMEOUT
SQLNET.RECV_TIMEOUT

Here is the sqlnet.ora file on my linux server:
AUTOMATIC_IPC = OFF
TRACE_LEVEL_CLIENT = OFF
SQLNET.EXPIRE_TIME = 10
NAMES.DEFAULT_DOMAIN = world
NAME.DEFAULT_ZONE = world

Can someone explain why I would add those parameters and what they think they should be.
I have never used those parameters.

Thanks,
Krystal