FC25: We've noticed that your computer is offline

Title: [Solved] EA FC25 – "We've noticed your computer is currently offline" Error on Launch

Hi everyone,
I recently ran into a frustrating issue while trying to launch EA SPORTS FC 25 (bought via Steam). The game splash screen loaded, but then I got this error:
"We've noticed your computer is currently offline. To activate your game on this computer using your EA Account, you'll need to connect to the internet."
At first, I thought it was my Wi-Fi acting up, but other online games (like Call of Duty) worked just fine. I tried restarting, resetting my network, allowing EA App through firewall — nothing worked.
A few days earlier, I had installed a tool called Fiddler Classic, and that turned out to be the cause.

What is Fiddler Classic?
Fiddler is a web debugging tool that allows you to monitor, decrypt, and alter network traffic. As part of setting it up, I had:
Set a proxy using the command: netsh winhttp set proxy 127.0.0.1:8888
Enabled HTTPS traffic decryption
Chose to ignore server certificate errors
Installed a custom root certificate from Fiddler
These changes were interfering with EA App’s ability to verify the online connection.

How I Fixed It:

Step 1: Reset the proxy
Open Command Prompt as Administrator and run:
netsh winhttp reset proxy

Step 2: Disable the system proxy manually
Go to Settings > Network & Internet > Proxy
Turn OFF “Use a proxy server.”
Keep “Automatically detect settings” ON

Step 3: Remove the Fiddler certificate
Open Fiddler and go to Tools > Options > HTTPS
Uncheck “Decrypt HTTPS traffic” and “Ignore certificate errors”
Click “Actions” and then “Remove interception certificates”
Or run certmgr.msc and delete “DO_NOT_TRUST_FiddlerRoot” under Trusted Root Certification Authorities

Step 4: Uninstall EA App and delete leftover data
Delete these folders:
%ProgramData%\EA Desktop
%AppData%\EA
%AppData%\Electronic Arts
%LocalAppData%\EA
%LocalAppData%\Electronic Arts

Step 5: Flush DNS and certificate cache. 

In Command Prompt (Admin), run these two commands:
ipconfig /flushdns
certutil -urlcache * delete

Step 6: Reinstall the EA App
Download the EA App from ea.com/ea-app
Launch the game through Steam to trigger EA App login and activation

Result: After following these steps, the game launched successfully without the “offline” error.

If you’ve ever used Fiddler or any other tool that changes proxy or certificate settings, that may be what’s causing this issue. Reversing those changes fixed the problem for me — hope it helps someone else here too.

Note: If you’ve used a different tool that modifies network behavior (not just Fiddler), undoing those changes may also resolve this issue.

If this helped you, feel free to give it a Like and mark it as a solution so others can find it easily.

— messifanhunny