web app deployment failing when initiated from vscode

Question

web app deployment failing when initiated from vscode. no indication in azure that the deployment even started.

Answer 1

Hello @Tony D'Alessandro,

If your web app deployment fails when initiated from Visual Studio Code (VSCode) and there is no indication in Azure that the deployment even started, there are several potential causes and troubleshooting steps you can take. First, ensure that you have set the correct configurations in your Azure App Service.

For instance, if you encounter a deployment failure with the error message “Failed to deploy web package to App Service,” it may be due to issues with the zipDeploy API, which can occur if the App Service cannot process the incoming package correctly. To resolve this, you should set the WEBSITE_RUN_FROM_PACKAGE app setting to in your App Service configuration. This can be done by navigating to your App Service in the Azure portal, selecting Configuration > Application settings, and updating the setting accordingly.

Troubleshoot Azure Web App deployment tasks

---

If this answers your query, do click Accept Answer and Up-Vote for the same. And, if you have any further query do let us know.

Answer 2

Hii @Tony D'Alessandro,

Thank you for reaching us about the issue When VS Code “just sits there” and nothing ever shows up in the portal, it usually means the extension/CLI never even kicked off a Kudu deployment. Please could you try using CLI command once.

Kindly let us know If you have any additional details or concerns in the meantime.
Please "accept" if the information helped you. This will help us and others in the community as well.

Answer 3

Use the following checks to troubleshoot VS Code–initiated deployments that never show up in Azure:

1. Verify the deployment method and task
   • VS Code uses the App Service deployment APIs (Kudu/zipDeploy) under the hood, similar to AzureWebApp@1 / AzureRmWebAppDeployment@4 tasks.
   • If the package is large, or the app is configured to run from package, deployment can be delayed or fail silently at the client side.
2. Check for network/connectivity issues
   • VS Code must reach <appname>.scm.azurewebsites.net (the Kudu endpoint). If a firewall, proxy, or network restriction blocks this, the deployment will fail before Azure sees it.
   • For environments with strict firewalls, ensure outbound access to the Kudu endpoint and, if using Azure DevOps agents, allow the Microsoft-hosted agent IP ranges.
3. Check for Kudu / App Service errors
   • In the Azure portal, open the Web App → Advanced Tools (Kudu) → Log stream or diagnostic logs to see whether any deployment attempt reached the app and failed server-side.
   • If you see 5xx errors (500/502/503) during deployment, follow the guidance to check App Service state, capacity, and Kudu logs.
4. Validate App Service state and capacity
   • In the Azure portal, confirm the Web App is Running and the App Service Plan has sufficient CPU/RAM/disk.
   • If deployments hang or fail with 503 or time out, scale up the App Service Plan or try a different plan.
5. If using WEBSITE_RUN_FROM_PACKAGE
   • When WEBSITE_RUN_FROM_PACKAGE is set, deployments are processed asynchronously and new files may not appear immediately in Kudu.
   • To get immediate, file-system–based deployments, remove WEBSITE_RUN_FROM_PACKAGE or set it to 0 in Configuration → Application settings, then redeploy from VS Code.
6. Cross-check with an alternative deployment path
   • Try deploying the same code via Azure DevOps using AzureWebApp@1 or AzureRmWebAppDeployment@4. If that also fails, use the pipeline logs and Kudu logs to identify whether the issue is connectivity, package size, or server-side errors.

If none of the above surfaces the deployment, focus on network/proxy/firewall configuration between the development machine and <appname>.scm.azurewebsites.net, as that is the most common reason for deployments not even appearing in Azure.

---

References:

• Troubleshoot Azure Web App deployment tasks
• Troubleshoot Azure Web App deployment tasks – Network connectivity errors during deployment
• Troubleshoot Azure Web App deployment tasks – 5xx error during deployment
• Troubleshoot Azure Web App deployment tasks – "Failed to deploy web package to App Service"
• Azure Web App service deployments related issues – Common issues and solutions
• How to Deploy my Web App with a Minimum Delay? - Microsoft Q&A