Httpd.cnf

Just noticed after patching from 8.5 to 8.5.1 that access to a Notes mail file over the web (using IE as a browser) was not working and “load http” on our Domino server gives an error -

“unable to read httpd.cnf”

“http server shutdown”

Now patched up to 8.5.1 Fix Pack 3 with no improvement

Solutions please?