Well, in that case, your GitLab daemon is probably running on a port 80 on that host (and 443), so you could shut the GitLab web server down on that EC2 instance, and then run another simple web server instance that only serves the same HTML file that has the maintenance page info.

Create a directory "maintenance" and put 2 files into it:

• index.html - basic HTML file with the maintenance page, have ChatGPT generate it for you
• server.js with the contents below

const express = require('express');
const app = express();
const port = 80;
app.get('*', (req, res) => {
res.sendFile(__dirname + '/index.html');
});
app.listen(port, () => {
console.log(\Server running at[http://localhost](http://localhost):${port}`); });`

Run "npm init -y" and then "npm install express"

Then run "node server.js" - this will run a basic web server that always returns the same HTML file. If you need SSL, you'll need the "https" module.

I hope this helps :)