IIS is the spawn child of satan
i hate IIS like poison.. almost as much as i hate NT permissions.. and only a less than i hate Securant Cleartrust..
these programs all try and auto-mate so much crap thus hiding the implementation formt he user.. which is good in theory, but when they dont configure properly it is impossible to figure out where to manually fix these things..

the stupidest thing ever could very well be so called "friendly error messages" which could just as easily be renamed to "useless error messages".. by keepign the message "user friendly" they basically take away any useful information about the error.. some examples of messages ive got today are:

"your server is not configured properly, check your configuration"
"an application server error has occurred"
"general access deined error"
"its busted foo"
"fudge, i dunno what happened"
"this program has bugs, deal with it"