There could be several reasons
why a user might do this. For example, they change
their mind and decide not to send a card, or they don??™t
have the type of card that is being requested. In this
case, there is little the site needs to do; the user should
be aware that he chose not to send a card, and should
not be surprised that he was not logged in to the site.
Not Installed. If the CardSpace extension is installed, but
.NET 3.0 is not, the core CardSpace components will not
be available. If the extension is called in this case,
Internet Explorer will redirect to a ???not installed??? page,
which contains a link for installing .NET 3.0. This is a
reasonable safety net; however, it is probably better for
a site to check up front if the machine is CardSpace
enabled.
Service Failure. A service exception can occur if the
CardSpace service failed to start. This could be caused
by the service being disabled. In this case, CardSpace
will redirect the user to a ???browser resource??? page,
which will give a standard error message.
Identity Validation Error. This can occur if the certi?¬?cate
on the website does not pass the check that CardSpace
uses to verify certi?¬?cates.
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