The Internet Gateway didn't let me change things, so I can't save my edits anymore.
The Internet Gateway didn't let me change things, so I can't save my edits anymore.
If it's not yours, you can't get in there and nobody on here will tell you how to sneak past the lock. Doing that would break the rules for everyone.
I don't know how you found a way to change port settings if you can't get in. There seem to be two routers, and the ax5400 looks like your main router. If there is another one right in front of it, that might be why things go wrong. Unless someone added special features recently, getting into a router usually means you have full control over settings. Most ISPs give modems or routers, but the ax5400 is a regular consumer model. That message probably means you didn't set up the options correctly. Port forwarding isn't normal between routers and some of them are really confusing to set up. Usually, I'd suggest using the DMZ setting because it's simple. But if there is another router in front of yours, that one will get your public IP instead of yours, which won't help. If you only have the ax5400 then again, how do you mean you don't have access since you seem to be able to log into it?