Mask Your Web Server for Enhanced Security
page 12 of 14
by Joe Lima
Feedback
Average Rating: This article has not yet been rated.
Views (Total / Last 10 Days): 49193/ 170

Netcraft is Watching
Take a look at the "What's that site running?" tool on Netcraft. If you point the site profiling tool at your own Web site, it will probably correctly report both your Web server and OS. Changing your HTTP Server header will cause Netcraft to report a false value for your Web server -- or just "unknown" if the header is completely removed (the change is not immediate, as Netcraft caches results for a time).

Still, your OS will probably be correctly identified -- even behind a good firewall. To get Netcraft to report your OS as "unknown", you will have to tinker with some of your default TCP/IP settings, such as the receive window size (RWIN), the maximum transmission units (MTU), the maximum segment size (MSS), and/or the IP header time-to-live (TTL). Altering these settings will affect your server's performance in diverse ways, depending on network conditions, so considerable care should be taken when changing these defaults. In the hands of a skilled network administrator, however, this strategy can be an effective countermeasure to information leakage through stack scanning.

View Entire Article

User Comments

No comments posted yet.

Product Spotlight
Product Spotlight 





Community Advice: ASP | SQL | XML | Regular Expressions | Windows


©Copyright 1998-2019 ASPAlliance.com  |  Page Processed at 2019-07-20 5:40:45 AM  AspAlliance Recent Articles RSS Feed
About ASPAlliance | Newsgroups | Advertise | Authors | Email Lists | Feedback | Link To Us | Privacy | Search