EditHow do I Enable Sending Referrers?
Unfortunately, there may not be simple straight forward answer. Listed below are methods to enable this function, so please check both what is listed for your browser and also your firewall.
EditInternet Explorer 6 and 7
This can be done from the computer's
Control Panel » Internet Options, or from within the browser :
Tools »
Internet Options
1. Click
Security » Trusted Sites » Sites
2. Add
Edulearn’s website address in the box provided and click
Add
(Uncheck the box that requires https verification)
3. Click the
Privacy tab (Medium is an acceptable setting on the slider)
» Sites, and again enter your website address)
» Allow
4. Click
ApplyThis has only altered settings for your website and this does not otherwise affect your browsing.
EditNorton Internet Security
Firewalls Can Prevent Web Pages From Displaying Properly
By default,
Norton Internet Security (NIS) and Norton Personal Firewall (NPF) block this referrer information. In order to allow referrer information to pass to a particular Website, you must create a
rule for it.
To create a rule for
Norton's NIS/NPF 2003 or NIS/NPF 2004, follow the instructions below:
Step 1: Start
Norton Internet Securityor
Norton Personal Firewall
Step 2: On your Norton Internet Security or Norton Personal Firewall, click
Privacy Control » Advanced or click
Options » Internet Security » Web Content
Step 3: At the bottom of the
Advanced window, click
Add Site
Step 4: In the
New Site/Domain box, type the name of the site that you want to receive the referrer information, and click
OK. The site name appears in the left frame of the
Options window
Step 5: Click the name of the new site
Step 6: Next, click on
Global Settings tab
» Information about visited sites section » uncheck Use default settings
Step 7: Click
Permit
Step 8: Click
OK to close the Options window
Alternatively, you can do the following,
Turn off Auto-Protect temporarily
- Right-click the Auto-Protect icon, which is located by the clock in the Windows system tray.
- Click Disable.
→For
Norton AntiVirus 2005:
Click on
Options popup window »
select the period for which you want Auto-Protect turned off » click
OK.
A red circle with a slash through its center appears, which indicates that Auto-Protect is disabled. 
Turn off Auto-Protect permanently
- In the system tray, double-click the Norton AntiVirus Auto-Protect icon
- From the Norton AntiVirus window, click Options » Norton AntiVirus
- Next, click on System, ensure that Auto-Protect is selected
For this dialog box, Auto-Protect is the default selection
- Next, click on How to stay protected » untick Turn Auto-Protect on (recommended)» OK
- Next, from the Select the duration drop-down menu, select Until system restart, and click OK
- From the Norton AntiVirus window, click the Close button
http://www.world-mysteries.com/firewalls.htm &
support.plato.com/kb/tip.asp?psid=2256EditZone Alarm Pro
Zone Alarm Pro blocks referrer information and certain types of cookies that are needed to verify your access to Edulearn resources. Follow these steps in Zone Alarm Pro for access.
→ For
Zone Alarm Pro Version 3, do the following:
Step 1: Open Zone Alarm Pro
Step 2: In Zone Alarm Pro, select
Privacy
Step 3: Next, click on
Cookie Control » Custom
Step 4: In Custom Privacy Settings, uncheck the box that say
Remove private header information
Step 5: Click
OK 
→ For
Zone Alarm Pro Version 4, do the following:
Step 1: Repeat the above
Steps 1, 2 and 3
Step 2: Make sure the box labeled
"Block Persistent Cookies" is not checked
Step 3: Make sure the box labeled
"Block Third Party Cookies" is not checked
Step 4: Make sure the box labeled
"Remove Private Header Information" is not checkedCredits: http://0101footworld.com/firewall.htmEditMcAfee
In the system tray in the lower right corner,
Step 1: Look for the M icon. Right Click.
Step 2: Click
Privacy Service » Open Privacy Service 
Step 3: Look on the right for the heading
I want to...
Step 4: Under the heading, click
Control Access to Cookies
Step 5: Click on
Accept for cookies from
Third-party sites
Step 6: Next, click the
Clean Slate tab in the upper right
Step 7: Next,
Uncheck Prevent referer at the bottom of the screen
Step 8: Click
Apply » Okay
Step 9: Close any remaining McAfee windows
Credits: http://0101footworld.com/firewall.htm