It looks like a login screen for an ADSL router/firewall as this is the server type:
Server: Agranat-EmWeb/R4_01
Does that look familiar? If not, maybe your IP address has changed and that is someone elses firewall. You should be able to configure your firewall to not use the http management on the external interface, and you also should be able to move it to a different port so it doesn't conflict with your forwarded port 80.


