Here are the steps I took. 1 - Installed GUF and restarted ZOPE (ok) 2 - Created a test folder called "test_guf" with acl_users and index_html 3 - Erased acl_users 4 - Installed a GUF with cookie based authentication A the point I got a logon screen and entered "jorge" "secret" and got this.. "Error Type: IOError Error Value: [Errno 5] Input/output error" and this at the end.. File /usr/local/zope/lib/python/Products/GenericUserFolder/User.py, line 211, in authenticate File /usr/local/zope/lib/python/zLOG.py, line 198, in LOG File /usr/local/zope/lib/python/Zope/ZLogger/ZLogger.py, line 18, in log_write File /usr/local/zope/lib/python/Zope/ZLogger/stupidFileLogger.py, line 40, in __call__ File /usr/local/zope/lib/python/Zope/ZLogger/stupidFileLogger.py, line 62, in stupid_log_write IOError: (see above) I know it has something to do with the Zlogger and writing to a file, but for the life of my there should be no problem doing that. Any help would be great, after this I am going to try and get it to work with SQL as per the HOW-TO. Thanks, JMA