OpenVAS is a great vulnerability scanner if you do not have the funds for Nessus/Nexpose/Qualys, but still want to do a little vulnerability scanning. It certainly isn’t the fastest scanner, but for free/open-source you can’t ask for more. Today I ran into an issue where OpenVAS stopped working on one of my test virtual machines (VM) and I found that OpenVAS has a config checker tool. Running that let me know something was wrong and give me the command to fix it, which to my surprise worked. Not sure why their link to the tool goes to another site with no good SSL cert, but here is the information page on the OpenVAS site that links to it.