Closing open ports in Debian 10
by andy657 from LinuxQuestions.org on (#5EARS)
Hi all,
I recently setup an email server using iRedMail. Everything is working perfectly I'm just having issues closing open ports with nftables.
I'm currently trying to close port 110...
This is what I have done so far... I removed the rule in the /etc/nftables.conf file for port 110 and restarted the service - sudo systemctl restart nftables.service
Unfortunately when I scan the port with nmap it's still showing as being opened.
What additional steps do I have to do in order to close this port?
Thanks for the help...


I recently setup an email server using iRedMail. Everything is working perfectly I'm just having issues closing open ports with nftables.
I'm currently trying to close port 110...
This is what I have done so far... I removed the rule in the /etc/nftables.conf file for port 110 and restarted the service - sudo systemctl restart nftables.service
Unfortunately when I scan the port with nmap it's still showing as being opened.
What additional steps do I have to do in order to close this port?
Thanks for the help...