Nighthawk app

Hello I am Fahad
I am Using NightHAWK app for 1 year..
But now I can't using this app . when i am enter router pass and click to sign in then this app showing me this massage " Logon timed out,please try again. if this issue persists ,try rebooting your device. " i have tried again and again and also rebooted my router twice but its not solved my problems..
my router R6260
firmware v : V1.10.84_1.0.1

app version : 2.11.5.1716