What is SSL State?

The Secure Sockets Layer / Transport Level Security system that underpins secure connections on the Web does more than just scramble information. It also checks the identities of sites to which you securely connect to ensure that they are who you say they are. Those proofs of identities, called certificates, get stored in your computer's memory until you restart it or clear the SSL state.
Setting up an SSL connection takes time. Your
computer has to download the certificate and verify
it, then use powerful public key encryption
technology to establish how it will do encrypted
transfers for the rest of the session. To save itself
from having to go through this process every time it
connects to that server, your computer stores, or
caches, the certificates until you shut it down. That
way, if it needs to reconnect, it's already part of the
way there.
Caching SSL certificates is a tradeoff, though. The
data that you store on your computer could get
corrupted, so that when you go back to reconnect to
the site, you would have the wrong certificate
information and the SSL handshaking process won't
work. In addition, something could change with that
other server's certificate, and you wouldn't know
about it since you would still be working with a
stored version.
Clearing the SSL state eliminates the problems of
caching certificates since it wipes out the cache.
Doing this shouldn't be necessary in day-to-day
computing, since resetting your computer or, in some
cases, closing your browser, will also clear your SSL
state. However, this procedure can be useful if you
don't reboot your computer very often or if you are
encountering problems with SSL connections.
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