400 Bad Request Error

Environment

Applies for many web-based services and web browsers

Issue

• Website is failing to load due to a Bad Request error.
• Error: "400 Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit"
  • This error may vary slightly to from computer to computer / browser to browser

Resolution

The 'Bad Request Error' is usually due to a large cookie. Here are the troubleshooting steps to take to clear this error:

1. Verify you are using a correct URL (website address) to access the service; it may help to use Wolverine Access to navigate to the service
2. Clear browsing history, cookies, and cache for all time
   1. If you do not want to delete all cookies in Google Chrome follow the instruction here in the section labeled Clear Cookies from A Single Site

Note: Steps 1 and 2 usually clear the error, so please test now before proceeding to step 3.

3. If you are uploading a file, confirm that the file size does not exceed published limits for the service
4. Clear DNS Cache
5. Deactivate browser extensions

Additional Information

Need additional information or assistance? Contact the ITS Service Center.