Symantec Support Center wrote:
Some Internet-enabled programs can no longer access the Internet after installing Norton AntiVirus

Situation:

After installing Norton AntiVirus some of your internet enabled software programs will no longer connect to the Internet.

Solution:
This can happen if no rule has been created for the program in Norton AntiVirus Internet Worm Protection.

To solve this, remove all existing program rules and then create a new rule for the application that is having the connection problem.

To remove all existing program rules

1. Start Norton AntiVirus. If Norton AntiVirus is installed as part of Norton SystemWorks or Norton Internet Security, then start that program.
2. Click Options. Click Norton AntiVirus if you see a menu.
3. On the left pane, select Internet Worm Protection.
4. On the right pane, click Program Control.
5. If there are programs listed, then click the first program in the list.
6. Press CTRL+ A to highlight all items.
7. Click Remove.
8. Click OK and close Norton AntiVirus.


To create a new program rule

1. Start the software program that has the problem. This should generate a dialog box.
2. Do the following, depending on whether you see the dialog box or not:
* If you do not see the dialog box: Skip to the section "To add a new program rule using the Add button" in the Technical Information section at the end of this document.
* If you see the dialog box: Go on to the next step.
3. On the dialog box, from the drop-down menu, click Permit.
4. Click OK.




Technical Information:
To add a new program rule using the Add button.

1. Start Norton AntiVirus. If Norton AntiVirus is installed as part of Norton SystemWorks or Norton Internet Security, then start that program.
2. Click Options. Click Norton AntiVirus if you see a menu.
3. On the left pane, select Internet Worm Protection.
4. On the right pane, click Program Control.
5. Click Add.
6. Locate the program executable for the program that is having the problem.
7. At the next dialog box, from the dropdown menu, click Permit.
8. Click OK.


What Internet Worm Protection does
Norton Internet Worm Protection is a firewall that protects your computer from incoming Internet traffic. If you have a program that receives data from the Internet, then by default, Internet Worm Protection blocks the incoming traffic, unless you create a rule to allow the program.