routerlongin.net not responding error

> [...]  for about a week now [...]

   What happened a week ago?  (Firmware update, for example?)

> [...] when I try to log in to my router I am able to enter the user
> name and password and then the home page does not appear. I get the
> message 'routerlogin.net not responding' [...]

   Once it stops responding, does it stay that way until you... what,
cycle the power?  Other than the router's management web site dying, is
it working as expected?

> [...] anyone seen this? model R6300v2

   Not I.  Have you tried a settings reset (and manual reconfiguration)?

   Visit http://netgear.com/support , put in your model number, and look
for Documentation.  Get the User Manual.  Look for "Factory Settings".