Index: vhosts/conf.d/11.306.conf
===================================================================
--- vhosts/conf.d/shenzhen.mit.edu.conf	(revision 146)
+++ vhosts/conf.d/11.306.conf	(revision 156)
@@ -11,4 +11,6 @@
 	DocumentRoot /afs/athena.mit.edu/course/11/11.306/web_scripts
 	SuExecUserGroup 11.306 11.306
+	<IfModule mod_ssl.c>
 	SSLEngine on
+	</IfModule>
 </VirtualHost>