Question
How to allow connections to a port from specific IP addresses only?
Answer
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Go to Tools & Settings > Firewall.
Note: If Firewall is not available, install it using the instructions from this KB article.
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Enable Firewall Rules Management and click Modify Plesk Firewall Rules.
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Click on an existing rule to edit.
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Select Allow from selected sources, deny from others and add IP addresses from which connections will be allowed.
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Click OK.
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Click Apply Changes.
Alternatively, use the OS native tool to achieve that:
For Windows (Windows Firewall)
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Connect to the server via RDP.
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Go to Start > Windows Powershell.
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Run the following command:
PS New-NetFirewallRule -DisplayName “Allow TCP:15555 from certain IPs” -Direction Inbound -Action Allow -Protocol TCP -LocalPort 15555 -RemoteAddress (203.0.113.2)
Note: Replace 203.0.113.2 and 15555 with the actual IP and network port to be allowed access from/to accordingly.
For Linux (iptables)
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Connect to the server via SSH.
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Run the following command:
# iptables -I INPUT -p tcp ! -s 203.0.113.2 –dport 15555 -j DROP
Note: Replace 203.0.113.2 and 15555 with the actual IP and network port to be allowed access from/to accordingly.
- (optional) For IP address range:
# iptables -I INPUT -p tcp ! –src-range 203.0.113.2-203.0.113.35 –dport 15555 -j DROP
Note: Replace 203.0.113.2-203.0.113.35 and 15555 with the actual IPs and network port to be allowed access from/to accordingly.
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Save the changes in iptables:
# iptables-save > /etc/sysconfig/iptables
