--- loncom/html/adm/help/tex/Domain_Configuration_Quotas.tex	2014/06/26 15:07:10	1.3
+++ loncom/html/adm/help/tex/Domain_Configuration_Quotas.tex	2017/12/01 20:57:35	1.7
@@ -16,7 +16,7 @@ can similarly be set to vary by institut
 If a user is affiliated with more than one group, whichever default
 quota is largest for the different groups is the one which applies.
 Institutional types are defined in the ``Institutional user types''
-section on the ``Default authentication/language/timezone/portal/types'' 
+section on the ``Default authentication, language, timezone, portal, types'' 
 screen. If no types have been defined, then a single default quota
 will apply for all users from the domain.
 
@@ -32,14 +32,51 @@ Authoring Spaces.
 
 WebDAV allows a user to connect to an Authoring Space in the same way as removable
 media, and to use their own laptop/desktop computer's file management tools and
-applications to move, edit and delete files.  In the case of MacOS, the user selects 
-the ``Go'' item in the Finder toolbar and selects ``Connect to Server''.
-The user will then enter a URL for a library server where the authoring space is located:
-e.g., https://s10.lite.msu.edu/webdav/msu/sparty/  where msu is the domain and sparty
-is the username of the Authoring Space.  Note: webDAV usage requires Apache/SSL to be 
-running on the  library server.  The user will be prompted to enter a username
-(this will be the LON-CAPA username, if the user is also the author, or username:domain 
-of the user, if the access is for a co-author), and the user's LON-CAPA password.
+applications to move, edit and delete files. See: ``WebDAV access to Authoring Space''
+section in the Authoring manual for more information.
+
+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. 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.
+This can achieved if the authentication type stored internally for each SSO user is 
+set to either (a) Kerberos 5 (with a parameter --  the appropriate Kerberos realm 
+set), or (b) Local Authentication, with /home/httpd/lib/perl/localauth.pm
+customized to verify username and password (e.g., via LDAP).  If a user can log-in  
+to LON-CAPA via the URL /adm/login (thereby by-passing SSO), then the same user will 
+also be able to authenticate using a WebDAV client (assuming other requirements are 
+met, i.e., SSL, WebDAV access enabled, active author or co-author role).
 
 The requirement to obsolete published files before moving or deleting them, which applies to
 the regular web browser-based management of Authoring Space, also applies in the webDAV