Update prerequisite-system.md
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@ -50,7 +50,7 @@ netstat -tulpn | grep -E -w '25|80|110|143|443|465|587|993|995|4190'
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```
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!!! warning
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There are several problems with running mailcow on a firewalld/ufw enabled system. You should disable it (if possible) and move your ruleset to the DOCKER-USER chain, which is not cleared by a Docker service restart, instead. See [this blog post](https://blog.donnex.net/docker-and-iptables-filtering/) for information about how to use iptables-persistent with the DOCKER-USER chain.
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There are several problems with running mailcow on a firewalld/ufw enabled system. You should disable it (if possible) and move your ruleset to the DOCKER-USER chain, which is not cleared by a Docker service restart, instead. See [this (blog.donnex.net)](https://blog.donnex.net/docker-and-iptables-filtering/) or [this (unrouted.io)](https://unrouted.io/2017/08/15/docker-firewall/) guide for information about how to use iptables-persistent with the DOCKER-USER chain.
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As mailcow runs dockerized, INPUT rules have no effect on restricting access to mailcow. Use the FORWARD chain instead.
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If this command returns any results please remove or stop the application running on that port. You may also adjust mailcows ports via the `mailcow.conf` configuration file.
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