What is Web Client Blocking? 77to this website has been denied. If you do not agree with this site beingblocked, please contact extension 1234”.To customize the response using the Web interface:1 Click Device View on the Toolbar.2 Select System -> Caching -> Customize Response in the NavigationTree.3 Enter up to 512 characters of text or HTML code in the Add This Text fieldthat you want to add to the response screen that informs the end userthat access has been denied. The text or HTML that you enter will beappended to the standard text that appears, which is “You are notauthorized to view this page”. You cannot change or delete this standardtext.4 If you want to view your changes before saving them to check that yourtext or HTML is correct, click Preview.Click OK to save the text or HTML code that you have entered.There is a default option in Microsoft Internet Explorer 4 and laterversions that will cause a “friendly HTTP error message” to be displayedwhen a Web site is blocked, rather than the response page generated bythe Webcache. You can turn this setting off by selecting Tools -> InternetOptions -> Advanced and unchecking Show friendly HTTP errormessages. The response page generated by the Webcache will never bedisplayed by Internet Explorer if you do not change this setting. Thefollowing Microsoft knowledgebase article describes the use of friendlyHTTP-status error messages:http://support.microsoft.com/support/kb/articles/Q218/1/55.ASPWhat is Web ClientBlocking?Web Client Blocking allows you to control which client machines in yournetwork can access the Web through the Webcache. If you enable WebClient Blocking, you can enter the static IP addresses or IP address rangesof client machines that you want to allow access to the Web through theWebcache. Web access from all other client machines will be denied bythe Webcache.Dynamic Host Configuration Protocol (DHCP) servers can be used withWeb Client Blocking in two ways:
