diff --git a/install_dehydrated.sh b/install_dehydrated.sh
index 32bfa9d..bb5ed1e 100755
--- a/install_dehydrated.sh
+++ b/install_dehydrated.sh
@@ -237,6 +237,7 @@ if [[ "$WEBSERVER_INSTALLATION" = "Apache2_Debian" ]] ;then
    APACHE_VHOST_DIR=/etc/apache2/sites-enabled
    APACHE_CONF_DIR=/etc/apache2/conf-available
    _set_apache_conf_symlink=true
+   apache_control_script=`which apachectl`
    apache_installed=true
 elif [[ "$WEBSERVER_INSTALLATION" = "Apache2_Source" ]] ;then
 
@@ -278,6 +279,7 @@ elif [[ "$WEBSERVER_INSTALLATION" = "Apache2_Source" ]] ;then
       APACHE_CONF_DIR=$APACHE_VHOST_DIR
    fi
 
+   apache_control_script=`which apachectl`
    apache_installed=true
 
 elif [[ "$WEBSERVER_INSTALLATION" = "Nginx_Debian" ]] ;then
@@ -347,24 +349,61 @@ _date=`date +%Y-%m-%d-%H%M`
 
 ## - Configure Apache..
 ## -
+apache_config_changed=false
 if [[ -n "$APACHE_CONF_DIR" ]]; then
 
    _apache_dh_conf_file=${APACHE_CONF_DIR}/000-dehydrated.conf
 
-   echononl "   Configure Apache Webserver: Create alias for WLLKNOWN Directory.."
-   cat << EOF >  $_apache_dh_conf_file
-Alias /.well-known/acme-challenge ${DH_WELL_KNOWN_DIR}/
+   echononl "   Configure Apache Webserver: Create alias for WELL-KNOWN Directory.."
+   if [[ -f "$_apache_dh_conf_file" ]] ; then
+      echo_skipped
+   else
+      if [[ -x "$apache_control_script" ]] && $apache_control_script -M 2> /dev/null | grep -q version_module > /dev/null 2>&1 ; then
+         cat << EOF >  $_apache_dh_conf_file
+Alias /.well-known/acme-challenge /var/www/dehydrated/
 
 <Directory /var/www/dehydrated/>
    Options +FollowSymLinks
    AllowOverride None
-   Require all granted
+   <IfVersion < 2.4>
+      Order allow,deny
+      Allow from all
+   </IfVersion>
+   <IfVersion >= 2.4>
+      Require all granted
+      Satisfy Any
+   </IfVersion>
 </Directory>
 EOF
-   if [[ $? -eq 0 ]] ; then
-      echo_ok
-   else
-      echo_failed
+         if [[ $? -eq 0 ]] ; then
+            echo_ok
+         else
+            echo_failed
+         fi
+      else
+         cat << EOF >  $_apache_dh_conf_file
+Alias /.well-known/acme-challenge ${DH_WELL_KNOWN_DIR}/
+
+# - Notice:
+# - If apache version < 2.4 (i.e. 2.2.x), then repclace lines
+# - 'Require all granted' and 'Satisfy Any' with:
+# -    Order allow,deny
+# -    Allow from all
+# -
+<Directory /var/www/dehydrated/>
+   Options +FollowSymLinks
+   AllowOverride None
+   Require all granted
+   Satisfy Any
+</Directory>
+EOF
+         if [[ $? -eq 0 ]] ; then
+            echo_ok
+         else
+            echo_failed
+         fi
+      fi
+      apache_config_changed=true
    fi
 
    if $_set_apache_conf_symlink ; then
@@ -375,6 +414,7 @@ EOF
          ln -s ../conf-available/000-dehydrated.conf /etc/apache2/conf-enabled/000-dehydrated.conf
          if [[ $? -eq 0 ]] ; then
             echo_ok
+            apache_config_changed=true
          else
             echo_failed
          fi
@@ -555,17 +595,21 @@ fi
 if $apache_installed ; then
    apache_control_script=`which apachectl`
    echononl "   Restarting (graceful) apache webserver.."
-   if [[ -x "$apache_control_script" ]]; then
-      $apache_control_script graceful
-      if [[ $? -eq 0 ]] ; then
-         echo_ok
+   if $apache_config_changed ; then
+      if [[ -x "$apache_control_script" ]]; then
+         $apache_control_script graceful
+         if [[ $? -eq 0 ]] ; then
+            echo_ok
+         else
+            echo_failed
+            warn "Graceful restart of apache webserver failed.."
+         fi
       else
-         echo_failed
-         warn "Graceful restart of apache webserver failed.."
+         echo_skipped
+         warn "Apache Control Script (apachectl) not found."
       fi
    else
       echo_skipped
-      warn "Apache Control Script (apachectl) not found."
    fi
 fi