What is Web Client Blocking? 77
to this website has been denied. If you do not agree with this site being
blocked, 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 Navigation
Tree.
3 Enter up to 512 characters of text or HTML code in the Add This Text field
that you want to add to the response screen that informs the end user
that access has been denied. The text or HTML that you enter will be
appended to the standard text that appears, which is “You are not
authorized to view this page”. You cannot change or delete this standard
text.
4 If you want to view your changes before saving them to check that your
text 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 later
versions that will cause a “friendly HTTP error message” to be displayed
when a Web site is blocked, rather than the response page generated by
the Webcache. You can turn this setting off by selecting Tools -> Internet
Options -> Advanced and unchecking Show friendly HTTP error
messages. The response page generated by the Webcache will never be
displayed by Internet Explorer if you do not change this setting. The
following Microsoft knowledgebase article describes the use of friendly
HTTP-status error messages:
http://support.microsoft.com/support/kb/articles/Q218/1/55.A
SP
What is Web Client
Blocking?
Web Client Blocking allows you to control which client machines in your
network can access the Web through the Webcache. If you enable Web
Client Blocking, you can enter the static IP addresses or IP address ranges
of client machines that you want to allow access to the Web through the
Webcache. Web access from all other client machines will be denied by
the Webcache.
Dynamic Host Configuration Protocol (DHCP) servers can be used with
Web Client Blocking in two ways:
