just some more guesses here...
your router-modem appears to be alive and at least minimally working.
does it use http or https for browser based configuration? or non-browser based configuration? a mismatch will cause an error corresponding to the lack of an appropriate configuration server on the router modem. assuming you want to configure it.
https is the secure version of http.
a http[s] configuration server might also require (depending on how it is set up at the factory) the name of a filesystem directory which can contain configuration directories and files. this would be concatenated at the end of the ascii address given to the browser. again this would seem to be for configuring the modem-router which may or may not be your intent (?)