This article provides troubleshooting and prevention steps for the following error encountered after successful authentication in Okta when accessing an application page. This issue occurs even on current versions of the Google Chrome browser.

ERR_HTTP2_PROTOCOL_ERROR

• Security Assertion Markup Language (SAML)
• Redirect
• Google Chrome

The error occurs when communication between the Hypertext Transfer Protocol (HTTP) application layer and the user device is interrupted. While often a client-side issue, it can persist on updated browsers due to:

• Corrupted browser data or conflicting extensions.

• Network interference from antivirus or firewall software.

Most modern systems utilize the HTTP/2 network protocol for data communication. If the error persists on the latest version of Chrome, perform the following steps to resolve and prevent the issue:

1. Clear Corrupted Browser Data

   • Navigate to Settings > Privacy and security > Delete browsing data.

   • Select All time for the time range.

   • Select Cookies and other site data, and Cached images and files.

   • Select Delete data.

2. Audit Browser Extensions

   • Navigate to chrome://extensions/.

   • Disable all extensions and test the application access.

   • Enable extensions individually to identify the specific conflict.

3. Check Local Security Software

   • Temporarily disable third-party antivirus or firewall software to determine if it blocks HTTP/2 traffic.

   • If the error resolves, add the application URL to the security software's allowlist.

4. Reset Browser Settings

   • Navigate to Settings > Reset settings.

   • Select Restore settings to their original defaults.

   • Select Reset settings.