How to Put SECURE_REGISTER_LISTENER in Oracle 11g rel2

Does any one has the steps to secure Listener for 11g rel 2 (11.2.0.3) using SECURE_REGISTER_LISTENER ?
We are using TCP and using Data guard but NOT RAC.
I put the below entry in the listener.ora and did the stop and start of the listener but not sure if there is some additional steps. ( I saw on Google that there is some sql to update the local_listener but some just put this below  entry and reload the listener).
I will check with experts.

I did the below 2 steps:---
1. Update listener.ora file with this entry
SECURE_REGISTER_LISFLLPRD = (TCP)
(Where LISFLLPRD  is my listener name)
2. stop and start the listener.
OranewAsked:
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OranewAuthor Commented:
Also, Is there any patch to be applied? We are current on CPU patches and already applied Oct CPU patches.
slightwv (䄆 Netminder) Commented:
As far as the listener goes, I would follow the following doc on Oracle Support:
Using Class of Secure Transport (COST) to Restrict Instance Registration (Doc ID 1453883.1)

Latest patches can also be found on Oracle Support's site.

I would caution you to not just patch because it is available.  Oracle loves to sneak new bugs into patches.

You need to make sure you do a pretty decent regression test after patches are applied.

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OranewAuthor Commented:
Yes. it make sense to ask Oracle about it.
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