DaemonUmbra

By any chance are you using Eclipse and following the instructions in the documentation? Those instructions are out of date and now actually break your run configs, if this is the case you should disregard the step of modifying the run configuration manually.

I would suggest using the @Config annotation instead.

Please don't necro old threads, if you have an issue make your own thread.

I don't know what your file manager settings are. debug.log is always the most recent log that Forge produces, the debug-#.log.gz files are older logs compressed when the new one is created.

debug-5 would actually be the oldest, I need the one that is debug.log with no numbers. Windows may be hiding the .log part from you unless you have changed that setting.

You post your debug.log on one of the sites I listed and provide the link that site gives you.

Please do not recommend that people modify their security settings.

That was not the issue, the issue was that the Forge servers were only providing their own certificate when they needed to provide the whole chain of certificates leading back to the root certificate that is trusted. Please do not modify your Java security settings unless you know exactly what you are doing. That being said the issue should be fixed now.

There was also this last night: https://github.com/MinecraftForge/MinecraftForge/issues/5807 which should be resolved now.

Did you notice the spoiler in my signature that looks like this: Expand that and read the "Logs" section which is in another spoiler

Take a look at my forum signature below.

Open a command prompt and type the command java -version, what pops up?

When you type that command it's looking for the forge installer in the "current directory"

See the part where it says C:\WINDOWS\system32>? That's the prompt itself and that's the current directory. Edit: Also don't rename the installer to .java. .jar and .java are not interchangeable.

Please provide a screenshot of your command prompt showing the commands you ran

Please take a screenshot of your download folder or wherever the installer was when you ran it

Sounds like you weren't in the correct folder when you ran the command. https://www.computerhope.com/jargon/c/currentd.htm

You say it didn't work when you ran it from the command prompt, can you provide a screenshot of what happens when you try to run it?

the folder that your computer downloaded that file to, you're not very tech savvy are you?

Open a command prompt or terminal and run the command java -version, what shows up?

the name of the installer log is literally the same as the installer, but with .log on the end

Please provide your installer log, it will be next to the installer.

Do you have Java installed? No, Minecraft Java Edition running does not mean you have Java installed.

MCU mod is broken/poorly made and will not work on servers, complain to the author.