I have a website in IIS for which I cannot open any of the settings like Authentication, Handler Mappings, Authorization Rules etc. It just shows the error message "There was an error while performing this operation", with no more details and points to web.config.
Browsing the website results in a 500.19 error.
I tried adding
It turned out the website was using URL rewrite module which i was missing.
Downloaded web platform installer from MS and installed URL rewrite module.
Wish IIS errors were more informative than just "There was an error..."