06-23-2015 06:06 PM
We'd like to drop any new SSL sessions if the system has reached the SSL Decrypted Session Limit.
This page, How to Implement and Test SSL Decryption, says to run:
> set deviceconfig setting ssl-decrypt deny-setup-failure yes
but it doesn't seem to be there in version 6.1.4
In the Web UI, there is an option under when creating a Decryption Profile, to "Block sessions if resources not available".
Is that the same thing?
06-23-2015 06:16 PM
The option that you are referring means "Terminate sessions if system resources are not available to process decryption" so the sessions will be dropped if the resources are not available.
Please rate the helpful answer.
06-23-2015 06:24 PM
Yes, I've read the help documentation.
Does that include the fact that there are no sessions available? Is a session in this context, considered a resource?
06-24-2015 09:46 AM
If you're out of sessions because your session table is full (show session info), a new session won't be installed whether or not it's SSL. A session is created on the first packet, and for SSL that typically means a TCP SYN packet on destination port 443.
If there is no available session, you won't get to the point where a decision can be made based on other factors.
So to answer your question, the "Block sessions if resources not available" means that the session has already been installed and there are no resources to actually handle the decryption.
06-24-2015 11:44 PM
There is difference in size of session table and max decrypted sessions.
For example max ssl sessions for 3050 and 3020 are following:
Max concurrent decryption sessions
3050 - 15,360
3020 - 7,936
So your session table does not have to be full but ssl decryption resources can be fully allocated.
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