MC1055555 - Microsoft SharePoint Online: We will remove retired DISCO and WSDL web pages

Updated October 20, 2025: Removal of these pages have started in late October 2025 and will be fully completed by end of November 2025.

ASP.NET DISCO and WSDL pages were the web service APIs for customers who wanted to create a proxy for their web services. The retirement of ASP.NET web services was announced in 2013 and should not be used. We encourage customers to move away from consuming these pages and use Microsoft Graph for remote operations where possible.

Please refer to the following information regarding the DISCO and WSDL endpoints

• These endpoints were originally designed for use with development tools from the early 2000s and were never a preferred or widely adopted method for generating proxy classes in SharePoint development.
•  These endpoints are not tenant-specific and are not associated with any individual tenant’s configuration or ownership.
• Usage across the SharePoint Online service is extremely rare. In fact, most of these endpoints show zero usage.
• These endpoints were primarily used in legacy development scenarios and are not required for modern SharePoint development practices.
• If your organization has an internal development team, we recommend consulting with them to confirm whether these endpoints are in use. However, it is extremely unlikely that they are being used in any current development workflows.

Learn more: Removal of deprecated DISCO & WSDL aspx pages from SharePoint Online - Microsoft 365 Developer Blog