Fixing the System.Object[] Conversion Error in Azure PowerShell for FTPS Configuration

Learn how to resolve the `System.Object[]` conversion error in Azure PowerShell when configuring FTPS for your web apps. This guide provides a step-by-step solution to streamline your Azure automation.
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Resolving the System.Object[] Conversion Error in Azure PowerShell for FTPS Configuration

When automating tasks in Azure, especially when dealing with multiple web apps, you may encounter various errors. One common error that can puzzle even experienced users is the Cannot convert 'System.Object[]' to the type 'System.String' required by parameter 'Name'. This error typically arises while attempting to loop through collections of objects without adequately managing their data types.

In this guide, we'll explore a practical solution for setting FTPS (FTP Secure) on all of your Azure web apps using PowerShell and how to avoid the conversion error.

Understanding the Problem

Suppose you're trying to enable FTPS for all web apps across your Azure subscriptions with a script that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

This script seems straightforward but results in an error message:

[[See Video to Reveal this Text or Code Snippet]]

The root cause of this error lies in how you're attempting to access the names and resource groups of web apps. Using (Get-AzWebApp) retrieves a collection of web apps, and attempting to extract .Name and .ResourceGroup from this collection results in an array of objects rather than a single string.

Solution Breakdown

To fix this issue, we need to loop through each web app within the context of each subscription correctly. This ensures that we're handling individual web apps as string values. Here’s a revised version of the script that does just that:

Step 1: Retrieve and Iterate through Subscriptions

First, we fetch all the subscriptions and iterate through each one:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Retrieve and Iterate through Web Apps

Next, we need to get all web apps in the selected subscription and loop through each specific web app:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Set FTPS State for Each Web App

Finally, we set the FTPS state to FtpsOnly for each web app using the following command:

[[See Video to Reveal this Text or Code Snippet]]

Complete Revised Script

Here’s the complete script all together:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By restructuring your Azure PowerShell script to properly iterate through web apps, you’ll effectively avoid the System.Object[] conversion error. This approach allows you to automate the FTPS configuration across multiple subscriptions seamlessly. Remember, the key takeaway is to always ensure that when handling collections, you properly loop through each item to access its individual properties.

With this solution, you are now equipped to carry out your FTPS configurations confidently. Happy scripting!