Quick Fix: CUHK Zoom SSO 400 Bad Request - Header Field Too Long

If you encounter a "400 Bad Request" or "Header Field Too Long" error while logging into Zoom via CUHK SSO, it is likely due to corrupted or oversized cookies from the authentication portal.

The Solution (Chrome):

Instead of clearing your entire browser history, just target the specific culprit:

1. Copy and paste chrome://settings/content/all into your Chrome address bar.
2. Search for sts.cuhk.edu.hk in the search box.
3. Click the trash icon (Clear data) next to it.
4. Restart your browser and try the SSO login again.

Why this works: Frequent SSO logins can cause your browser’s "request header" to exceed the server's size limit. Clearing the data for the CUHK STS domain resets this handshake and resolves the error instantly.

---

This content was automatically generated by Gemini 3.1.