Opening the firewall for one internal IP.

[jmccoppin]

I am attempting to open our Fortigate firewall for one specific IP to troubleshoot some issues with an external vendor. How would I go about this?

Fortigate 100F v7.2.7 build1577

Any help would be greatly appreciated!

[AEK]

I guess you mean you want to give access to your vendor to some internal IP address.

In this case the good and secure way is to configure a VPN access, IPsec, otherwise SSL VPN.

https://docs.fortinet.com/document/fortigate/6.2.16/cookbook/785501/forticlient-as-dialup-client

https://docs.fortinet.com/document/fortigate/6.2.16/cookbook/559546/ssl-vpn-full-tunnel-for-remote-u...

Hope it helps.

[jmccoppin]

Thanks for the response, but that isn't what I meant. I have one computer that connects to an external email account. Something is blocking this connection and we can't determine what. We want to open the firewall for that computer to see if the issues still happen.

[Quint021]

Hello @jmccoppin ,

Utilizing the trusted host feature or local-in policy is recommended for your request.

Please see the following article which explains the setup in further detail: https://community.fortinet.com/t5/FortiGate/Technical-Tip-System-administrator-best-practices/ta-p/1... 

Kind Regards,

[jmccoppin]

Thanks for the response, I'm not asking for admin access restriction. Just opening the firewall for a specific computer.

[AEK · Accepted solution]

You may add a temporary rule at top of the rules, with these parameters:

• Source: IP of the workstation
• Destination: ALL
• Service: ALL

Remove this rule once the tests are done.

[jmccoppin]

Thank you for your help!

[ahabeeb]

You should run a pcap first on the IP to see what external IP it is reaching out to and what is blocking it.