KB Article #163473
What is the "SSL Session Cache size" that is configurable for a HTTPS interface?
The SSL session cache size controls the number of idle SSL sessions that can be kept in memory. This is used to gain a performance improvement because this caches the slowest part of the SSL connection establishment. A new connection will not need to go through full authentication if it finds its target in the cache.
If you go over 32 simultaneous SSL sessions then it will not prevent another SSL connection from being established it will just mean no more SSL sessions will be cached,
(Note that a cache size of 0 is a special case meaning the cache is disabled so no SSL connections are cached).
At debug level or higher we do trace when an entry goes into the cache. e.g.
DEBUG 09:09:12:953 [0d50] cache SSL session 11AA3894 to support.vordel.com:443
and if it is full it will look like this.
DEBUG 09:09:12:953 [0d50] enough cached SSL sessions 11AA3894 to support.vordel.com:443 already