Avoid this confusion around Client certificate mapping in IIS 6.0/7.0

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I just wanted to add this quick post around Client certificate Mapping on IIS. This is focused on 1-to-1/Many-to-1 mapping in IIS 6.0/7.0.

If you are interested to know more about configuring Client certificate mapping in IIS 6.0 please check this post of mine and for IIS 7.0 this is an excellent article.

Recently a colleague of mine and I was working on this issue for one of our internal teams and after some real slogging we figured out that one *cannot* set this mapping at any Virtual directory/Application level in IIS.

One has to set the Client certificate mapping at the specific Web site level only!

image This is wrong!

image This is right!

I couldn't find a documentation on this so thought of putting this as a short post for general audience in case someone is scratching their head over this.

Cheers!