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Troubleshooting internet

How to report faults right

Helpful screenshots in case of a DSL malfunction

Problems with the speed

Why is my internet connection so slow?

Complete failure

Why can't I connect to the internet?
Why does my DSL not work after (new) activation?
What are the causes of a PPPoE error due to timeout?

Router problems

What can I do when my router is broken?

Other issues