To prevent Symantec Endpoint blocking access to our Endpoint you must follow the below steps:
Steps:
- Click on Policies button
 - Under view Policies > Select Firewall
 - Edit the existing Firewall Policy
 - Click Rules
 - Right Click Rule Number 2 and Select Add a Blank Rule
 - Right Click on the Host Select Edit
 - Under Specify host names or addresses of computers that trigger the rule Select : Local /Remote
 - Under Remote Click Add Under Type Select DNS domain
 - Under DNS Domain type the name of the Website (Repeat step 9 for each domain,including the"*.")
 - Click OK and close the Host List Window
 - Click OK and close the Firewall Policy Window
 - If you do not wish to make the policy Global follow the below:
- Assign the policy to the desired group