In httpd.conf, make sure the Apache server only listens to port 80 on the localhost interface:
<code>Listen 127.0.0.1:80</code>
Also add, to the end of httpd.conf, the following (this is to support Touchstone):
</code>ProxyPass /Shibboleth.sso/ https://idp.mit.edu/Shibboleth.sso/
ProxyPassReverse /Shibboleth.sso/ https://idp.mit.edu/Shibboleth.sso/
ProxyPass /Touchstone/ https://idp.mit.edu/Touchstone/
ProxyPassReverse /Touchstone/ https://idp.mit.edu/Touchstone/</code>
In squid.conf:
<code>http_port ist-prod-pubs1.mit.edu:80 defaultsite=ist.mit.edu vhost
http_access allow all
cache_peer 127.0.0.1 parent 80 0 no-query originserver name=Accelerator
</code>