- > If you deploy the application gateway via an ARM template, either by using the Azure CLI or PowerShell, or via an Azure application deployed from the Azure portal, the SSL certificate is stored in the key vault as a base64-encoded PFX file. You must complete the steps in [Use Azure Key Vault to pass secure parameter value during deployment](../azure-resource-manager/templates/key-vault-parameter.md). It's particularly important to set `enabledForTemplateDeployment` to `true`. The certificate may be passwordless or it may have a password. In the case of a certificate with a password, the following example shows a possible configuration for the `sslCertificates` entry in the `properties` for the ARM template configuration for an app gateway. The values of `appGatewaySSLCertificateData` and `appGatewaySSLCertificatePassword` are looked up from the key vault as described in the section [Reference secrets with dynamic ID](../azure-resource-manager/templates/key-vault-parameter.md#reference-secrets-with-dynamic-id). Follow the references backward from `parameters('secretName')` to see how the lookup happens. If the certificate is passwordless, omit the `password` entry.
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