After installing a certain server product that also configures IIS for its use, my website does not allow execution of ISAPI DLLs from a directory named "bin". That is, the website stopped working the way it did (with its DLLs in the bin directory).
When creating a new website from scratch, everything works fine, DLLs are executed from any directory (setting proper handler mappings) unless they carry the name "bin".
What could possibly cause IIS to become configured that directories are not allowed to carry the name "bin" anymore and block execution ?
This is on IIS 8, Win 2012 Server R2.