To limit the maximum size of a header in HTTP requests

  1. In the console tree of ISA Server Management, click Firewall Policy.
  2. In the details pane, click the applicable access rule or Web publishing rule.
  3. On the Tasks tab, click Edit Selected Rule.
  4. On the Traffic tab (for Web publishing rules) or on the Protocols tab (for access rules), click Filtering, and then click Configure HTTP.
  5. On the General tab, in Maximum headers length (bytes), type the maximum number of bytes that a request can have in its headers (URL and headers) before it is blocked.



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