In case this is helpful for someone running Visual Studio 2013. I had upgraded my Visual Studio from 2010 to 2013 and then started seeing the seurity warning.
Using Fiddler I found that VS 2013 kept sending arterySignalR requests.
I turned this off by setting the following in the web.config under appSettings
<add key="vs:EnableBrowserLink" value="false" />
which caused the security warning to go away.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…