Opening Data Load Editor fails with Error Code 16 after Qlik Sense Enterprise on Windows upgrade

[Nobuaki_T]

After upgrading Qlik Sense Enterprise on Windows (example: February 2024 to November 2024), the Data Load editor fails to load.

The error:

Connection lost. Make sure that Qlik Sense is running properly. If your session has timed out due to inactivity, refresh to continue working.

Error Code: 16

The console log reads:

Error during WebSocket handshake: Unexpected response code:431

Resolution

Adjust the MaxHttpHeaderSize as documented in Qlik Sense Client Managed: Adjust the MaxHttpHeaderSize for the Micro Services run by the ServiceDis....

Cause

The console error 431 means Request Header Fields Too Large in HTTP.

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Environment

• Qlik Sense Enterprise on Windows