Error message:
Over time, the session cookies build up until Blackboard throws an error similar to the following:
- HTTP Status 400 - Bad Request: Request header is too large
- Bad Request - Header Field Too Long
- HTTP Error 400. A request header field is too long
To fix this issue:
Switch to another browser, use Incognito (or Private Window) mode, or delete the cookies for the Blackboard site.
Below are links to instructions on how to delete the cookies for a specific website:
- Chrome (scroll down to "Delete cookies from a site")
- Edge (scroll down to "Delete cookies from a specific site")
- Firefox
- Safari (scroll down to "Remove stored cookies and data")