Online portscanners
This list shows you links to free online portscanners. These will try to access your pc by using different ports. Even when you have a firewall installed it's a nice way of looking at your visibility on the net.
- AuditMyPc
- Der Keiler
- Dslreports
- Emisoft
- Hackerwatch.org Probe
- PC Flank
- Shields Up
- Sygate
- Symantec Security Check
- Whacker Hacker
Note: When you have a firewall present on your system you may get an intrusion warning, this is most likely the site from which the portscan originates so don't worry. It's a good sign when your firewall notifies you of this scan, this demonstrates your firewall is working like it should