Upgrading CAS from pre-2.0.12 versions
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Upgrading from a pre-2.0.12 version will be mostly seamless with the
important exception of a newly-required login ticket to be passed
by the form on login.jsp.  Within the <form> and </form> tags of your
current login.jsp, you will need to add the following:

<input type="hidden" name="lt" 
    value="<%= request.getAttribute("edu.yale.its.tp.cas.lt") %>" />

This will pass the login ticket to the login servlet.

See the history for versions 2.0.12beta and 2.0.12beta2 for more
detailed information.
