router

what router do you you have? 

What firmware is on it? 

Whatt modem/gateway is it connected to? 

Is this as new device? New modem? Whats changed?

Did you try checking to see what default IP address the router is at and using that to connect to it? Pull up a command prompt and type "ipconfig"  the default gateway should be the router IP address. Try using that. 

Details are key to helping on any online forum. The more you tell us, the better we can help. When you're vague, short descriptions, no details, we're just guess at everything and hoping something works. You decide the help you want to receive