--- loncom/html/adm/help/tex/Domain_Configuration_Quotas.tex	2015/05/29 23:17:11	1.6
+++ loncom/html/adm/help/tex/Domain_Configuration_Quotas.tex	2017/12/01 20:57:35	1.7
@@ -38,7 +38,35 @@ section in the Authoring manual for more
 Note: webDAV usage requires Apache with SSL to be running on the library server.  
 The user will be prompted to enter his/her username (this will be the LON-CAPA username
 or username,domain if the access is for a co-author with a domain different 
-to that of the author), and the user's LON-CAPA password. 
+to that of the author), and the user's LON-CAPA password. webDAV also requires that the
+dav and dav_fs modules are enabled in Apache. The way those are enabled depends on the 
+Linux distro (command line access required).
+the Apache config.  
+
+\begin{itemize}
+
+\item CentOS, Red Hat and Scientific Linux (6 and earlier)
+
+The required LoadModule lines are included in the /etc/httpd/conf/httpd.conf
+file added by install.pl run to prepare a server for installation of LON-CAPA.
+
+\item CentOS, Red Hat and Scientific Linux 7
+
+The required LoadModule lines are in the default /etc/httpd/conf.modules.d/00-dav.conf 
+file added when the httpd rpm is installed.
+
+\item Ubuntu
+
+Use the commands: a2enmod dav and a2enmod dav_fs to enable the modules. 
+
+\item SLES
+
+The APACHE_MODULES entry in /etc/sysconfig/apache2 contains the list of modules to be
+loaded. If dav and dav_fs are not present they should be added to the list.
+
+\end{itemize}
+
+(Reload Apache after making any changes to the Apache configuration).
 
 If you use Single Sign On to authenticate LON-CAPA users in your domain, then to
 support webDAV you also need to support authentication by LON-CAPA for your users.