Antti K. Koskela 4/7/2026

Blazor Server in Azure App Service 404 errors

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This article provides a troubleshooting guide for a Blazor Server app hosted on Azure App Service that suddenly becomes unresponsive. The issue is caused by WebSockets being disabled, leading to connection failures and errors like 'Failed to start the transport 'LongPolling'. The solution involves navigating to the Azure Portal, enabling Web Sockets under General Settings, and restarting the app. A practical fix for a common Azure deployment problem.

Blazor Server in Azure App Service 404 errors

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