When ITP/MDK Repository runs an ITP Model on ITP/OnLine Server, it generates a URL for that, which is UTF-8 encoded. In case your web server does not support that, you can configure the project not to use UTF-8 encoding on the URL. In the project configuration dialog, select the Test Model tab, and prefix "(plain)" (without the quotation marks) to the ITP/OnLine URI configured there, e.g., "(plain) http://mywebserver/itp/app/sample/modelbegin.jsp?"