<p>What is the best way to configure Tomcat 5.5 or later to authenticate users from Windows Active Directory?</p>

From
www.jspwiki.org
See :
ActiveDirectoryIntegration
Try this in the server.xml with your ldap-settings :
```
```
<Realm className="org.apache.catalina.realm.JNDIRealm" debug="99"
    connectionURL="ldap://youradsserver:389"
    alternateURL="ldap://youradsserver:389"         
    userRoleName="member"
    userBase="cn=Users,dc=yourdomain"
    userPattern="cn={0},cn=Users,dc=yourdomain"
    roleBase="cn=Users,dc=yourdomain"
    roleName="cn"
    roleSearch="(member={0})"
    roleSubtree="false"
    userSubtree="true"/>
```
```
And define the role in the tomcat-users.xml and the web.xml of your application
Edit
```
webapp_root/WEB_INF/Web.xml
```
file as follows:
```
```
<security-constraint>
   <display-name>your web app display name</display-name>
   <web-resource-collection>
     <web-resource-name>Protected Area</web-resource-name>
     <url-pattern>*.jsp</url-pattern>
     <url-pattern>*.html</url-pattern>
     <url-pattern>*.xml</url-pattern>
   </web-resource-collection>
   <auth-constraint>
     <role-name>yourrolname(ADS Group)</role-name>
   </auth-constraint>
 </security-constraint>
 <login-config>
   <auth-method>FORM</auth-method>
   <form-login-config>
     <form-login-page>/login.jsp</form-login-page>
     <form-error-page>/error.jsp</form-error-page>
   </form-login-config>
 </login-config>
 <security-role>
   <description>your role description</description>
   <role-name>yourrolename(i.e ADS group)</role-name>
 </security-role>
```
```