Test your router for open ports
Sometimes, if you buy a new router, or if you use the one from your internet provider, it isn´t as secure as it should be. Open ports mean, that a malicious software can go through your firewall and attack the component that is listening behind that port.
To test for open ports you need an online portscanner.
Right-click on the link above and select "open in new tab".
On the website of the online portscanner select "scan":
This will take a while, just wait a few minutes until the process is finished.
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