If you are using IIS 6.0 with UrlScan and IISLockdown with security limitation settings in urlscan.ini file, which contains a property that restrict the Period(".") symbol, i.e 'AllowDotInPath' is marked as '0' by default and this causes issue in running the samples. To fix this change the 'AllowDotInPath=1', it allows the usage of '.' operators in virtual directory file name.
The above issue also applies if you use any of the IIS version with UrlScan and IISLockdown.
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