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How to fix “ERR_CONNECTION_CLOSED” error
Written by Tania Nguyen
Updated on January 31st, 2025
Sometimes you may get the “ERR_CONNECTION_CLOSED” error when starting a profile.
Testing the proxy
This error typically means your proxy is offline or not working properly. Don’t worry – we’ve got multiple ways to fix the issue.
Test your proxy
How to test a proxy
Most profile issues, according to our users, are caused by a malfunctioning proxy. But how can you tell if the problem is with Multilogin or your proxy?
The answer: check your proxy connection.
In this article, we’ll guide you through three simple methods to test your proxy and pinpoint the issue.
How to test a proxy using Multilogin
This is the simplest and quickest way to test a proxy:
- Open your profile settings and navigate to the "Proxy" section
- Click "Check proxy" or "Get new IP" – this will test the connection
Here’s what the results mean:
- Proxy check passed: great news! Multilogin connected to your proxy and got everything it needs. If you still can’t launch the profile, share the error with us so we can assist!
- Proxy check failed: hmm, looks like Multilogin couldn’t connect. This might mean your proxy is offline. No stress – keep reading for more ways to troubleshoot
Multilogin X
Multilogin 6
How to test a proxy using browser extensions
Want another way to check if your proxy is working? Use a browser extension to test it in a regular Firefox and Chrome browser:
- If the proxy doesn’t work in a regular browser (you can’t load any pages), contact your proxy provider for help
- If the proxy works in a regular browser but not in Multilogin, let our support team know so we can investigate!
If your proxy doesn’t work in a regular Chrome or Firefox browser, it won’t work in Multilogin either.
No worries, though – your proxy provider can help! They might:
- Fix a server-side issue
- Provide you with a new proxy
- Adjust some settings to get things running
Reach out to them, and they’ll sort it out for you!
How to test a proxy using local settings
Finally, you can check your proxy by adding it to your device’s network settings. Then, try loading a website in your browser.
Here’s what to do next:
- If the proxy doesn’t work (you can’t load any pages), contact your proxy provider for help
- If the proxy works fine on your device but not in Multilogin, reach out to our support team – we’ve got your back!
Windows
- Open the start menu in the bottom left corner and click the gear icon
- In the “Windows Settings” menu, go to “Network & Internet”
- Click “Proxy” in the left panel to access proxy settings
Automatic setup
Enable the “Use setup script” option – you'll get the PAC file path in the “Script address” section.
Ensure the PAC file is saved on your computer, and there’s a complete path to it.
Manual setup
- Under “Manual proxy setup” enable the “Use a proxy server” option
- Enter your proxy details into the “Address” and “Port” sections
- Enable “Don’t use the proxy server for local (intranet) addresses”
macOS
- Open your system settings and type “proxies” in the search field
- Click “Proxies” in the search results to see a list of proxy protocols
Automatic setup
Enable the “Automatic proxy configuration” option – you'll get the PAC file path in the “URL” section.
Ensure the PAC file is saved on your computer, and there’s a complete path to it.
Manual setup
- Enable the “Web Proxy (HTTP)” or “Secure Web Proxy (HTTPS)” option
- Enter your proxy details into the “Server” and “Port” sections
Proxy test is fine?
How to fix profile launch or proxy connection issues
Most profile issues happen because of a broken proxy. Before you do anything else, test your proxy first. Use this guide to check if your proxy works properly in Multilogin.
Once you're sure the proxy is fine, you can move on to the steps below to fix things. Let’s get it sorted!
Check the agent
Look at the top right corner of your screen – see your agent status? It should say "Agent connected".
The agent is the desktop app that keeps things running smoothly. It’s what lets you launch browser profiles. If it’s not connected, you won’t be able to test your proxy in a profile.
Quick tip: disconnect and reconnect the agent. This restarts important Multilogin processes and often fixes the issue. Need help? Check this guide for step-by-step instructions. You got this! 👍
Check 3rd-party apps
3rd-party apps
Apps like antivirus programs, firewalls, VPNs, or proxy tools (e.g., Proxifier, SocksEscort) can interfere with Multilogin.
Here are some quick fixes:
- Uninstall these apps if you don’t need them
- If you do need them, disable the apps temporarily or add Multilogin to their whitelist in the settings
This should help resolve the issue and keep everything running smoothly!
Check the ISP
ISP
Sometimes, internet service providers (ISPs) block proxy providers or even Multilogin itself. Here’s how to test and work around it:
- Try connecting through a VPN: this can bypass ISP restrictions
- Switch networks: use a different Wi-Fi, or turn your phone into a hotspot with mobile data
- Check your speed: if your current ISP is slow, changing networks might also improve performance.
If the issue resolves with these steps, it’s likely your ISP causing the trouble.
Refresh components
Deps
This action is completely safe! It refreshes the app components needed for Multilogin to work smoothly. No data will be lost during the process, so you're good to go! 😊
- Disconnect the agent
- Go to the mlx folder:
- Windows:
C:\Users\%username%\mlx - macOS:
/Users/%username%/mlx - Linux:
/home/%username%/mlx
- Windows:
- Delete the deps folder
- Connect the agent to get things rolling
- Start any profile – this will automatically kick off the components download process
Nothing helps?
If you still can't launch a profile, send us your proxy details (IP or hostname, port, login, and password) and logs. We’ll investigate and provide the best solution for you!
Logs
- Recreate the issue or wait until the error message appears
- Archive the logs folder found in these locations:
- Windows:
C:\Users\%username%\mlx - macOS:
/Users/%username%/mlx - Linux:
/home/%username%/mlx
- Windows:
- Email support at [email protected] with:
- A clear description of the issue
- The archived logs folder attached