Cannot access Router but still have internet access

[aravindu43]

I have a D-Link ADSL2 Router from which I use the internet, beginning i was able to access the router page with default username and password.
When I recently tried to login, it says 400 Bad Request. I haven't changed the username or password, but don't know the reason why I can't access my router through 192.168.1.1 which I can in the past.
I have internet access and can surf the net without any problem.

Any one Please Help

Thanks in advance

 

[digitaldoc]

I would reset the router to the factory specs. There is a button to hold down in the back for 15 secs to do this. This should reset everything. Than upgrade to their latest firmware and see if either of these solve your issue.