Trados GroupShare is installed/hosted within Microsoft Azure. Browsing various pages on the Trados GroupShare WebUI is returning the following error:

You are not allowed to perform this action.

In the Developer Mode of the web browser, you can see in the Preview tab the following message:

403 Forbidden
Microsoft-Azure-Application-Gateway/v2

In the Response tab of the browser Developer Mode you see:

It needs to be double-checked in the WAF settings and allow the required security ID(s), which block access to the information on the Trados GroupShare WebUI.

The first approach would be to investigate/review the WAF logs which might return detailed information which rule is blocking the request. When found, it can be excluded in the settings.

Further information can be found here: Troubleshoot - Azure Web Application Firewall | Microsoft Learn

 

NOTE:

There is no need to completely disable the rule, however, it should be possible to add exceptions for Trados GroupShare.

The Microsoft article https://docs.microsoft.com/en-us/azure/web-application-firewall/ag/application-gateway-waf-configuration#waf-exclusion-lists shows how to stop blocking the traffic using an exclusion list.

Also https://docs.microsoft.com/en-us/azure/web-application-firewall/ag/web-application-firewall-troubleshoot shows troubleshooting steps and it basically provides possibilities how to adjust the WAF for the applications to let traffic get through.

This is related to the web application firewall (WAF) in Azure when the Application gateway firewall mode is running in prevention mode. The WAF actively blocks intrusions and attacks detected by its rules defined.