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Windows Only: Configure IIS to Enable VS Code

Windows Only: Configure IIS to Enable VS Code

On Windows systems which use IIS, you must configure IIS to allow VS Code to connect with your InterSystems IRIS instance. The necessary IIS configurations are described in the sections which follow. For detailed instructions on configuring IIS, refer to the IIS documentation ( in a new tab).

Disable the WebDAV Module

The IIS WebDAV module (if it is installed) interferes with the Web Gateway when both are enabled to handle communication for an InterSystems IRIS instance’s /api/atelier application. This application provides the connection between the instance and VS Code.

To use VS Code with an InterSystems IRIS instance, you must remove the WebDAV Handler Mapping and disable the WebDAV Module for the relevant path. Depending on your web server configuration, this relevant path may be the instance prefix path, /<instancePrefix>/api, or /<instancePrefix>/api/atelier.

You can perform these configurations using the Internet Information Services Manager, or by editing the applicationHost.config file to include <remove> directives within the <location> directive block for the relevant path ({path}) as in the following example:

<location path="{path}">
      <remove name="WebDAVModule" />
      <remove name="WebDAV" />

After making changes to the IIS configuration, restart IIS to ensure they take effect.

Enable the WebSockets Feature (for Debugging)

The debugging tool in VS Code requires a WebSockets connection to the InterSystems IRIS instance. Ensure that the IIS WebSocket Protocol feature is enabled by performing the following steps:

  1. Open the Windows Features manager by searching for Turn Windows features on or off, or by opening the Control Panel and selecting Programs > Programs and Features > Turn Windows Features on or off.

  2. Select Internet Information Services > World Wide Web Service > Application Development Features.

  3. Select WebSocket Protocol, if it is not already selected.

  4. Select OK.

  5. Restart IIS to ensure all changes take effect.

Allow Double Escaping (to Access Certain Packages)

For any file with a name which begins with the % (percent) character followed by two hexadecimal digits (that is, numerals between 0 and 9 or letters between a and f), IIS interprets these first three characters as an encoded hexadecimal character by default. As a result, VS Code cannot view or edit such a file.

If you must view or edit such a file, you must configure IIS Request Filtering to Allow double escaping, either globally or for the specific IIS application location which corresponds with your instance. You can modify this setting by using the IIS Manager or the command line interface (see in a new tab) or by setting the attribute allowDoubleEscaping="true" for the appropriate <requestFiltering> element within the IIS configuration file (see in a new tab).

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