Hello Community,

We are seeking assistance with a critical authentication issue we've encountered after updating our Trados GroupShare 2020 SR1 server from CU05 to CU13.

Problem Summary:

After the update, users are unable to log in to the GroupShare web interface or connect via Trados Studio.

• The web interface shows the error: "A request could not be processed by the server. See browser console for details."
• The browser's developer console reveals the specific error is: Failed to load resource: the server responded with a status of 404 () /api/authentication/token.

This 404 Not Found error on a core API endpoint suggests a server-side configuration issue.

Troubleshooting Steps Already Performed:

We have carefully followed the guidance in the RWS Knowledge Base.

We initiated the update from CU05 to CU13. Before starting, we backed up our original web.config file as a standard precaution. After the update, when the authentication failed, we consulted RWS Knowledge Base article KB0039503. Following the note in the article, we downloaded the recommended web.config templates for CU12/CU13. We replaced the existing web.config in C:\Program Files (x86)\SDL\SDL Server\Platform\ with the new web_HTTPS_CU12andCU13.config file (correctly renamed to web.config). We then performed a full IIS restart using the iisreset command.

Despite correctly replacing the web.config file as recommended, the issue persists with the exact same 404 error on the /api/authentication/token endpoint.

Since the primary recommended solution (replacing the web.config) has not resolved the problem, we believe there may be a deeper issue, possibly related to permissions, IIS application pool settings, or another configuration change that occurred during the significant jump from CU05 to CU13.

Could anyone in the community offer further advice or suggest what we should investigate next? Are there specific logs in the Windows Event Viewer or GroupShare's own logging that would be most helpful for diagnosing why this API route is not being found?

Thank you in advance for your help.