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Azure App Service
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
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Thanks for asking question! Could you please confirm if you running on Linux Free sku ?
As "Web Sockets are not currently supported for Linux apps on Free App Service Plans. We are working on removing this limitation and plan to support up to 5 web socket connections on Free App Service plans."
You may refer to this doc link: https://learn.microsoft.com/en-us/azure/app-service/faq-app-service-linux#web-sockets
Incase you are on running on windows please confirm if you have enabled the Web sockets on from configuration tab.
Check this link: https://azure.microsoft.com/de-de/blog/introduction-to-websockets-on-windows-azure-web-sites/?WT.mc_id=-blog-scottha
Let us know if you have further query on this or issue remains.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 7.000000000000001%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERP%3C/text%3E%3C/svg%3E)