https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570387#M12664 <P>When I click on <STRONG>“Launch Sandbox,”</STRONG> an error message is displayed.</P><P>&nbsp;</P><CENTER><H1>400 Bad Request</H1></CENTER><CENTER>Request Header Or Cookie Too Large</CENTER> Thu, 20 Aug 2026 12:10:44 GMT Abdul Samad Shaikh 2026-08-20T12:10:44Z https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570387#M12664 <P>When I click on <STRONG>“Launch Sandbox,”</STRONG> an error message is displayed.</P><P>&nbsp;</P><CENTER><H1>400 Bad Request</H1></CENTER><CENTER>Request Header Or Cookie Too Large</CENTER> Thu, 20 Aug 2026 12:10:44 GMT https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570387#M12664 Abdul Samad Shaikh 2026-08-20T12:10:44Z https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570391#M12665 <P>A 400 error indicates a "client side" fault. Try again in an incognito tab.</P> Thu, 20 Aug 2026 12:19:29 GMT https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570391#M12665 Torbjørn 2026-08-20T12:19:29Z https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570392#M12666 <P>Issue has been resolved. Thanks for your Support</P> Thu, 20 Aug 2026 12:22:10 GMT https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570392#M12666 Abdul Samad Shaikh 2026-08-20T12:22:10Z https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570398#M12667 <P>No problem, glad I could help!</P> Thu, 20 Aug 2026 12:52:40 GMT https://community.cisco.com/t5/devnet-sandbox/devnet-sandbox-issue/m-p/5570398#M12667 Torbjørn 2026-08-20T12:52:40Z