I had a few problems running nph-build, nph-verify and nph-email. It would run them in the background, but would show me an "Internal Server Error". If you are getting an "Internal Server Error" there are a few lines in these scripts that need changing. Click on the link to view the full details.

This is a quick fix for the illegal division by zero error that sometimes occurs.

This tutorial will help you set up password protection on your links directory.