I am new to ISA and I have been trying to get it working as a Unihomed Proxy server. I have used the template and checked the Ip addresses. I have created a firewall rule to allow all traffic. I can ping sites on the web but it will not pass HTTP pages, or allow FTP. I have trawled the message boards and tried other suggestions but I am getting nowhere.
you will need to great a firewall rule that allows HTTP and HTTPS from the internal network to the external network for all users. Once I added this rule I was fine.
Thanks for the reply, however I have established a rule to allow all traffic through and I still cannot access the web. I can ping individual sites but unable access web pages. Anybody any ideas, thanks in advance.
I'm having the exact same problem. I an running a unihomed ISA2004 box on the LAN to be just a proxy server. I created a firewall rule that reads:
Action: Allow Protocols: DNS, HTTP, HTTPS From: Internal, Localhost To: External Condition: All Users
This only presents the ISA2004 "Error 502" page. If I change the "To:" rule to include a URL set with some websites in it, I can get to those websites.
It is as if the network object "External" is not really recognized as being the Internet. So far I have no solution.
I had to edit the properties of the Network called "Internal" under Configuration->Networks, then the default Networks tab.
It had the default address range applied to it that basically included everything. I removed the default ranges and added only my local ranges. Problem solved.
I guess the network called Internal correlates to the LAT in ISA2000.
That is an incorrect config that could have some unintended effects. Since the unihomed Web Proxy isn't a security solution per se, all adddresses in the IPv4 are internal.
This is still a problem for me. I have tried the suggestions and have now gone back to originl configuration, a rule allowing all traffic, but I am still unable to access any web pages. We are only using ISAServer as a web proxy, Proxy 2 works fine so why won't ISAServer.
But if this is the case why is there an option to set it up as a unihomed server. I have applied the template and created a rule and it doesn't work. I was hoping that this forum would supply me with some pointers. I am using it as a simple Web Proxy because that is what is required in my organisation, I know it is a firewall and should have 2 nic's but that is not an option at the moment. This is a new server running Server 2003 and therefore I cannot load Proxy 2 onto it.
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