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App service tcp dns #127224

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c02bcb7
Add DNS over TCP limitation
maciejporebski Jun 26, 2025
4ad4010
Fix implement typo
maciejporebski Jun 26, 2025
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4 changes: 4 additions & 0 deletions articles/app-service/overview-name-resolution.md
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Expand Up @@ -66,6 +66,10 @@ Validate the settings by using this CLI command:
az resource show --resource-group <group-name> --name <app-name> --query properties.dnsConfiguration --resource-type "Microsoft.Web/sites"
```

## Limitations

- App Service does not support falling back to DNS resolution over TCP when it encounters a truncated response over UDP. Configuring App Services to use a DNS server which does not implement EDNS to negotiate UDP responses larger than the standard 512 byte limit may result in DNS resolution failures.

## Next steps

- [Configure virtual network integration](./configure-vnet-integration-enable.md)
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