ERR_HTTP2_PROTOCOL_ERROR in web browser

Question

Some of our clients are occasionally receiving a "ERR_HTTP2_protocol_Error" error and the site does not load. What could be causing this?

Answer

The "ERR_HTTP2_PROTOCOL_ERROR" errors are client-side errors; this indicates that the client did not receive the expected data or the received data was corrupted in transit. The "ERR_HTTP2_PROTOCOL_ERROR" can occur for many different reasons:

• Outdated software. When a device's operating system is old or outdated, it may not be able to handle http2 data packets. Apply any updates that may be available.
• Corrupted browser cache. If the cache is corrupted, you will need to clear the cache for the web browser.
• Conflicting browser extensions. Try disabling any plugins or extensions for your web browser and consider trying a different browser.
• Third-party antivirus or firewall software. Many antivirus software programs will block traffic and may prevent HTTP2 data. Consider disabling the AntiVirus protection temporarily.