BC 25 to 26 onprem- WebSocket connection failed due to missing Authorization header

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Posted on by HM-14111226-0

Hi everyone,

We recently upgraded our environment from Business Central 25 onprem to Business Central 26 onprem, and since then we’re seeing repeated errors in the Event Viewer.

The login via Entra ID (Azure AD) still works fine — users can sign in and access Business Central without any problem.

However, the Event Viewer is showing the following error many times:

WebSocket connection failed due to missing Authorization header

Has anyone else run into this after upgrading to BC 26?

Is there a known fix or configuration change needed for WebSocket or Entra authentication in this version?

Thanks in advance for any help!
HJ

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Dynamics 365 Business Central

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