When attempting to launch Sandbox - 400 Bad Request

[justinsellstrucks]

Hello, first time attempting to do this and I am using Firefox on Win 11 on a last gen PC. 

When I hit the launch Sandbox button in the DevNet I am getting the error:

400 Bad Request

Request Header Or Cookie Too Large

[justinsellstrucks · Accepted solution]

I'm sorry, this was a browser issue. If there's a way to remove this post, let me know and I will.

[jlapsley]

Hello @justinsellstrucks, did you change browsers as a solution? I have cleared my cache in FireFox, refreshed, and had it working. Few moments later and I'm receiving this error again. 

Thanks!

[justinsellstrucks]

No, my fix was only temporary as well. I figured it was a user issue and haven't picked it back up since.

[jlapsley]

If you do jump back in, try incognito. Fortunately, I’ve had no issues when using Incognito. 🤷‍♂️

[Jesus Illescas]

Unfortunately this is a known issue when you visit several Cisco sites and the sandbox portal. The way to fix it is to clear your cookies. The engineering team is working on a fix but might take a while.