Security Vulnerability Scan using Nessus
Test the Security of Your Broadband Internet Connection Now (YES ITS FREE)
Option 2: Security Scan
Use this option to test your open ports for security vulnerabilities. Updated daily this will tests thousands of potential security problems with your server or host. Be sure to read our Terms of Service as you must agree to these before running a scan.
While it is unlikely there is a possibility that this service may have adverse affects on your connection.
Note that this Option will scan the IP that you are browsing from if you would like to scan other IP's that you manage you might like to check out HackerTarget.com for a full scan subscription.
For more info on Broadband Networking visit dslreports.com.
Good luck and I hope you find these scanning options useful!