I often see many people having trouble with OS X computers behind ISA Server: AOL IM, MSN Messenger, HTTP/HTTPS access and so forth do not function correctly. OS X supports the autoconfiguration for proxies via a PAC file. Under Networks, go to the network connection you want to configure, and then to the Proxies tab. Scroll to the bottom of the list of proxies and select Automatic Proxy Configuration.
In the URL box, type in:
http://proxy.server.net:8080/wpad.dat
...where proxy.server.net is the fully qualified domain name of your proxy server. Note that wpad.dat must be in lower-case, otherwise it will fail. Also note that OS X will connect as a SecureNAT client, so your IT department must configure SecureNAT clients (many Windows shops will just use the standard Firewall client, which is Windows-only).
This hint may or may not work with ISA Server 2004.
•
[15,252 views]

