Fix Gmail 'Temporary Error (500)' - Numeric Code Fix

Updated: 11/29/2025

You try to open an email, and the screen turns into a list of code with the message: 'Temporary Error (500). We’re sorry, but your Gmail account is temporarily unavailable.' Despite the name, this error can last for days if you don't fix the root cause. It happens when your browser sends a corrupted request header to Google's servers.

Method 1: Clear Gmail Cookies Only

You don't need to wipe your whole browser history, just the Gmail data.

Step 1: Settings

In Chrome, go to chrome://settings/siteData.

Step 2: Search Google

Type mail.google in the search bar.

Step 3: Remove

Click the Trash Can next to the Gmail entries. Refresh the page and sign in again.

Method 2: Disable 'Net-Scanning' Extensions

Extensions that scan your email for coupons, grammar, or tracking pixels often break the Gmail UI.

• Open Extensions (Puzzle Piece Icon).
• Disable Grammarly, Honey, or AdBlock temporarily.
• Reload Gmail. If it works, one of those extensions needs an update.

Method 3: Use the HTML Version (Emergency Access)

If you absolutely need to read an email right now and the main site is broken, use the Basic HTML mode.

Go to this URL:

This loads a retro version of Gmail that works even on broken browsers or slow connections.