diff --git a/install/alternc.install b/install/alternc.install
index edffe8a4..9b095c9b 100644
--- a/install/alternc.install
+++ b/install/alternc.install
@@ -210,17 +210,22 @@ if [ -x /usr/sbin/apache2 ]; then
         a2enmod $php
         s="apache2"
     fi 
-    if ! grep '^Listen.*443$' /etc/apache2/ports.conf; then
-        echo "Listen 443" >> /etc/apache2/ports.conf
-        s="apache2"
-    fi
-    if [ ! -h /etc/apache2/mods-enabled/ssl.load ] ; then
-        a2enmod ssl
-        s="apache2"
-    fi
-    if [ ! -h /etc/apache2/conf.d/alternc-ssl.conf ] && [ -e /etc/apache2/conf.d/ ]; then
-        ln -sf /etc/alternc/apache-ssl.conf /etc/apache2/conf.d/alternc-ssl.conf
-        s="apache2"
+    if [ -e /etc/alternc/apache.pem ]; then
+        if ! grep '^Listen.*443$' /etc/apache2/ports.conf; then
+            echo "Listen 443" >> /etc/apache2/ports.conf
+            s="apache2"
+        fi
+        if [ ! -h /etc/apache2/mods-enabled/ssl.load ] ; then
+            a2enmod ssl
+            s="apache2"
+        fi
+        if [ ! -h /etc/apache2/conf.d/alternc-ssl.conf ] && [ -e /etc/apache2/conf.d/ ]; then
+            ln -sf /etc/alternc/apache-ssl.conf /etc/apache2/conf.d/alternc-ssl.conf
+            s="apache2"
+        fi
+    else
+        echo "SSL not configured"
+        echo "create a certificate in /etc/alternc/apache.pem and rerun alternc.install"
     fi
     if [ ! -h /etc/apache2/conf.d/alternc.conf ] && [ -e /etc/apache2/conf.d/ ]; then
         ln -sf /etc/alternc/apache2.conf /etc/apache2/conf.d/alternc.conf