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What firmware version do you have? Are you sure that the IP address is correct?
Is it really a 404 or just a blank page? In second case it could be an issue with Javascript-forwarding (blocked by a browser-extension?) and you can try to enter http://<ip>/Login.html
Hello. I've been trying to create something that allows me to use a different interface for the control of the relay. Other people have been able to get into a login page. I get a 404 on the root page.
http://Device_IP/login_real.htm