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How do I troubleshoot "failed to connect" messages?

Josh | Last updated: Feb 19, 2015 11:53PM UTC

So, I load up Burp Pro, restore defaults (latest versions of burp and JRE), enable the proxy and then in Chrome, with FoxyProxy browse to the site I want to scan/spider. I add said site to scope, and then start spidering. In the alerts tab there will be an increasing number of alerts saying that I failed to connect to the site name, and the same thing happens when I use the scanner. Burp is not using an upstream proxy, and I have no idea why this is happening. The alerts tab doesn't give a lot of information. What can I do to troubleshoot?

PortSwigger Agent | Last updated: Feb 23, 2015 10:29AM UTC