Failed to fetch error on login

This error is almost always a network or browser issue — not a problem with your account. Work through these steps in order.

Disable browser extensions

Ad blockers and privacy extensions can block requests Hadrius makes during login. Open a private/incognito window (extensions are disabled by default) and try signing in.

Check your VPN

If you're on a VPN, disconnect and try signing in again. Some VPN configurations block the API calls Hadrius makes during authentication. Once logged in, you can reconnect.

Check your network firewall

On a corporate network, your firm's firewall may be blocking Hadrius. Ask your IT team to allow traffic to:

• hadrius.com

• app.hadrius.com

• hadriusapi.com

Clear cache and hard reload

In Chrome: open DevTools (Cmd+Option+I on Mac, Ctrl+Shift+I on Windows), right-click the reload button, and select Empty cache and hard reload. Then try signing in again.

Try a different network

Sign in on your phone's mobile data (no Wi-Fi, no VPN). If that works, the problem is with your office or home network — not your account.

💬 Still stuck? Contact Hadrius support with your browser name, network setup (VPN/office/home), and a screenshot of the error.