Edit the firewall policy associated with the clients to add a corresponding rule as follows:
- Open the Symantec Endpoint Protection Manager (SEPM), click the Policies tab, and edit the policy you wish to change
- Add a blank rule
- Modify the “Host” properties so that the “Source/Destination” IP is the address you wish to block (Local/Remote is less generic, and requires the local address of the client on which the rule should be applied)
- Change the “Action” to Block
- Save and deploy the policy as needed.
This will block all incoming and outgoing traffic associated with the specified IP address.
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