How is your server co´nnected to the internet? Do you use a external router?
The ispconfig firewall is for servers that use external routers or are in a datacenter, you can not use the firewall if the server itself uses a software router and is the gateway for other devices on the network as this will cause a conflict in iptables rules.
To fix this if your server is also the network router of your network, simply stop the firewall with its script in /etc/init.d
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