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Error: "Web socket is closed or could not be opened"

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This article discusses how to resolve the "Web socket is closed or could not be opened" error message that prevents Microsoft Azure Container Instances from connecting to a virtual network.

Symptoms

When you try to connect to your container from the Azure portal, you receive the following error message:

The following web socket error occurred: error: Web socket is closed or could not be opened. Please validate your network connection and retry the attempt.

Cause

Your firewall blocks access to port 19390. This port is required to connect to Container Instances from the Azure portal when container groups are deployed in virtual networks.

Solution

Allow ingress to TCP port 19390 in your firewall. At a minimum, make sure that your firewall gives access to that port for all public client IP addresses that the Azure portal has to connect to.

Contact us for help

If you have questions or need help, create a support request, or ask Azure community support. You can also submit product feedback to Azure feedback community.