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Hello, I installed WHMCS on a PLESK server except that to link with an API it asks me to open the port 4085 I opened it with iptables but it is still closed I wanted to know if plesk have their own system for ports because I do not understand
Outgoing port 4085 should be open by default. If it is not, there is a chance that in front of the server, in the data center you have an additional firewall. That can be controlled by you data center's server control panel.