Hi all, We use Apache as a front-end to a Subversion repository on Linux. We're using SSL, with basic authentication backed by LDAP against a Windows Server 2008 domain controller. Every so often, we get a 500 Internal Server Error when trying to write to the SVN repository. The following message appears in ssl_error_log: [crit] [client X.X.X.X] configuration error: couldn't check access. No groups file?: /svn/!svn/bln/401 I'm aware that this is a common error caused by missing modules and/or broken authentication configurations. However, our authentication IS working -- but only about 80% of the time. I've looked around for other log files that might have more detailed information, but can't find anything. Any suggestions on how I might troubleshoot this further? I really have no idea where to start. Relevant SSL/SVN configuration: LoadModule dav_svn_module modules/mod_dav_svn.so LoadModule authz_svn_module modules/mod_authz_svn.so LoadModule ssl_module modules/mod_ssl.so <Location /svn> DAV svn SVNPath /data/svnroot AuthBasicProvider ldap AuthType Basic AuthzLDAPAuthoritative off AuthName "<censored>" AuthLDAPURL "<censored>" NONE AuthLDAPBindDN "<censored>" AuthLDAPBindPassword <censored> <Limit GET PROPFIND OPTIONS REPORT> require valid-user </Limit> <LimitExcept GET PROPFIND OPTIONS REPORT> require ldap-attribute memberOf="<censored>" </LimitExcept> </Location> System specifications: RHEL 5.7 x86_64, 2.6.18-238.12.1.el5 SMP Apache 2.2.3 (RPM 2.2.3-53.el5) Windows domain controller = Windows Server 2008 SP2 Many thanks in advance! DN. --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx