Usually we are working from office and there is no issue when accessing PA CLI or web interface.
Now when we are working from home and connecting to GP, we still can access and is there any ways to block the access?
If we are not connecting to GP, there is no issue.
To add to the already excellent suggestions you have received, you really should be using permitted-ip address configuration to lock down access to your firewall from only select addresses. Your firewalls should be one of the most locked down devices that you have on your network, so use all of the three suggestions in conjunction. You don't need to be allowing traffic to the firewalls management address from any address/zone you don't need it, use user-id to restrict access solely to users that should be accessing the management interface, and use permitted-ip so that only source IPs you've specified will get a response from the firewall's management interface.
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