I want Jenkins to check SVN every few minutes for changes. So I give a URL to check: svn://host/some/path/project/trunk. Jenkins says, I am not authenticated. So I follow the link to authenticate. As I want to authenticate only once for all projects, I provide the URL svn://host, not the complete path to one particular project. I give user and password, and Jenkins says the authentication is OK.

When I come back to the job config, Jenkins still warns that the authentication is not working. I ignore this and start a build, and look, Jenkins can access the SVN repository without problems. So I go back to the config, and still Jenkins says, it cannot authenticate... weird.