Updated the list of ports we let through the firewall.

www/faq.html

@@ -663,12 +663,12 @@ tb-set-node-startup $clientB {/users/myname/router-startup router1}
 <li><a NAME="SEC-1"></a>
     <h3>Is Emulab Firewalled?</h3>
     <p>
-    Yes. Emulab blocks all of the <i>low numbered</i> ports (ports
-    below 1024), with the exception of port 22 (Secure Shell). This is
-    for the protection of experimentors, as well as to ensure that an
-    errant application cannot become the source of a Denial of Service
-    attack to sites outside of Emulab. If your application requires
-    external access to other low numbered ports, please contact us to
-    make special arrangements.
+    Yes. Emulab blocks all of the <i>low numbered</i> ports (ports below 1024),
+    with the exception of ports 20 and 21 (FTP), 22 (Secure Shell), and 80
+    (HTTP). This is for the protection of experimentors, as well as to ensure
+    that an errant application cannot become the source of a Denial of Service
+    attack to sites outside of Emulab. If your application requires external
+    access to other low numbered ports, please contact us to make special
+    arrangements.
     </p>
 </ul>