Linksys X2000 Ethernet port problem

Hello
When I connect any cable to the ethernet ports on my router, it automatically disconnects from DSL. I just bought this modem yesterday and cannot get over this problem.
It works normal when I don't connect anything to ethernet ports.
I updated the firmware to v 2.0.03 but still no change.

It is really strange that the performance of the router was affected when there is a device connected to the router’s Ethernet port. If that is the case then there could be something with the settings on your router. By the way, have you installed a PPPoE dialer (Broadband icon) on your computer? If you do, then set that PPPoE dialer to “cancel as default” or might as well disable it. You might also need to start from scratch in order for you to fix this problem and that is by resetting the router. Then use the link below for instructions on how to set the router to PPPoE.
Setting up a Linksys router for DSL Internet connection

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