Isa server hacking

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Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions. Adding ISA Server to your Windows Server installation can help to protect machines on your internal network from the depredations of crazies on the Internet. Like this article? We recommend. We recommend Like this article? Overview Pearson Education, Inc. This is also possible if an Internet user has a modified version of the Microsoft Proxy Client installed.

One is attached to the Internet, while the other is attached to the private network. Normally, machines on your network that access the Internet through the ISA Server either won't have a default gateway configured, or the default gateway will be the ISA Server's IP address on the private network.

It's very important that the ISA Server itself not be configured in this manner, though. Excessive services A couple of months ago, I did some consulting work for a company that had decided to save some money by running multiple Microsoft Server products on a single box.

While this is not at all uncommon for smaller companies to do, the problem was that in addition to running Exchange and SQL, the server was also running ISA Server. The box was acting as both a firewall and as an application server. As you can imagine, this is just a bad idea. You never want your mission-critical applications loaded onto a server that's directly connected to the Internet. The company had definitely managed to save a few bucks on server licensing, but had risked their network's overall security in doing so.

A less dramatic example of a poorly configured ISA Server is a server that's running lots of different services. If a Windows Server has all of the appropriate service packs and hot fixes installed, there are no huge security holes in any one service. However, there are lots of documented techniques in which minor bugs or even features in a service can be exploited in conjunction with bugs or features in other services, resulting in a massive security breach. The point is that any of the services by themselves were relatively harmless, but when used together they can compromise security.

My advice is to disable any service that isn't absolutely necessary on the ISA Server. ISA should be the server's sole application and anything that isn't specifically required for ISA needs to be disabled. Remember that your ISA server absolutely must be the most secure server on your network.

Generally speaking, the techniques I've discussed so far will take care of most of the ISA-related security problems. There is one more area that needs to be examined though: Unless you have the appropriate filter rules in place, your ISA Server is useless.

One of the great things about ISA Server is that out of the box it already has a relatively secure configuration. You can make that configuration even more secure by tweaking the filter rules. However, these tweaks can also cause problems. One such problem involves confusing the ISA Server. I once saw a situation in which someone somehow managed to configure an ISA Server with contradictory filter rules.

While ISA Server does have an algorithm for dealing with contradictory rules, in doing so it ignores one of the two contradictory rules.

This means that either a service you want to support will be blocked, or traffic you want to block will be allowed to flow onto your private network. My advice is to set up an ISA Server in a test environment prior to implementing it as your company's main firewall. In doing so, you will have the opportunity to experiment with various filter rules.

You may also use some of the various hacker tools to experiment with trying to hack your ISA Server before you use the server to guard anything important. Another common problem involves packet filtering.

I strongly recommend that you filter packets on all ports that aren't specifically needed. Be especially sure to block ports , , , and In this article I would instruct for ISA version.

Note: Require all users to authenticate option is not recommended to be checked, as it could block any services running in background of client PC which may not provide authentication such as windows update etc.

Microsoft recommends enforcing user authentication on firewall policy access rules and publishing rules instead of requiring all users to authenticate to the Web Proxy listener. Now click OK and apply to apply the settings. The settings would be in action automatically.

Though, I would recommend you all to configure it. My reason is different from those who warn for the same. IIS is not recommended, because it compromises the Firewall security, as IIS uses port 80 for publishing various web based applications over the internet.