How To Find My Arris Router's Settings for T25

I have an Arris T25 router in place for a few years and suddenly, it seems that it is blocking traffic coming to my router on Port 21.  I need to see my settings, but entering 192.168.86.1 into a browser simply tells me it’s ONLINE; it doesn’t show me my settings.

Can you please tell me how to see my settings?

Thank you.

Len Jacobson