I have deployed openrdf-workbench and openrdf-sesame both on a tomcat server using basic auth password protection. I get prompted for userid and password to show the workbench or the openrdf-sesame start page, that works fine. However when I try to work with the openrdf-sesame component in the openrdf-workbench, the URL is not accepted and the error message "Invalid server URL" is always shown. I tried these four versions of the URL (the workbench is on http://my.server.com:8080/openrdf-workbench) * http://my.server.com:8080/openrdf-sesame * http://user:firstname.lastname@example.org:8080/openrdf-sesame * http://localhost:8080/openrdf-sesame * http://use:pass@localhost:8080/openrdf-sesame The logs show the error message: "java.io.IOException: Server returned HTTP response code: 401 for URL: <theURL>" for all those. If there is a way to do this correctly I could not find it in the documentation.