error code 4: no internet connection and orange light

Hey,

After a few years I suddenly can't access my Time Capsule anymore. I have the same problem (I think) as explained in this discussion (error code 4). When I try to configure the Time Capsule there is always the same message. It says: "check your internet connection. error code 4."

Also there is flashing an orange light.

What do I have to do? I already did a factory reset and that changes anything...

Thanks for your help!!!