it is common for the web interface port to be configured for forwarding, which will cause these symptoms.
try this from the command line
iptables -t nat -F
and see if that enables you to get in and correct the offending rule.
Thanks for the quick reply. I tried the command but I'm still having no luck getting in. Just "Page cannot be displayed" using http or https. I know it was working in the past.
on the command line will show you which ports are listening of which one will be what the web server is enabled on ?
Does this match what you expect ?