Firewall Configuration

Firewall Configuration

Although the Zimbra Installation instructions tell you install Zimbra on a system without a firewall, you can get Zimbra to work on a system as long as all needed ports are opened on the firewall.

Needed Ports

Standard Zimbra ports

</td><td>

<tr><td>HTTP</td><td>80</td><td>tcp</td></td><td></tr> <tr><td>POP3</td><td>110</td><td>tcp</td></td><td></tr> <tr><td>IMAP</td><td>143</td><td>tcp </td><td>(should probably be limited by a firewall to your local network only)</td></tr> <tr><td>LDAP</td><td>389</td><td>tcp</td></td><td></tr> <tr><td>HTTPS</td><td>443</td><td>tcp</td></td><td></tr> <tr><td>SMTPS</td><td>465</td><td>tcp</td></td><td></tr> <tr><td>IMAPS</td><td>993</td><td>tcp</td></td><td></tr> <tr><td>POP3S</td><td>995</td><td>tcp</td></td><td></tr>

</table>

• Admin Interface
  • port 7071/tcp should probably be limited by a firewall to your local network only
• LMTP
  • port 7025/tcp should probably be limited by a firewall to your local network only

Cluster Suite Ports

These would only be used on a zimbra cluster. All of these ports should be limited by a firewall to your local network only.

• rgmanager
  • port 41966/tcp
  • port 41967/tcp
  • port 41968/tcp
  • port 41969/tcp
• ccsd
  • port 50006/tcp
  • port 50007udp
  • port 50008/tcp
  • port 50009/tcp
• dlm
  • port 21064/tcp
• cman
  • port 6809/udp
• gnbd
  • port 14567/tcp

Example Configuration Files

RedHat Advanced Server

The following iptables configuration file will block all ports on a clustered zimbra server except those used by zimbra, the cluster suite, ssh, and snmp. This assumes that your local network is 10.10.3.0/255.255.255.0.

/etc/sysconfig/iptables

# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# enable ssh and snmp
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 161 -j ACCEPT -s 10.10.3.0/24
# enable zimbra ports
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 25 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 110 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 143 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 389 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 465 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 993 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 995 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 7071 -j ACCEPT -s 10.10.3.0/24
# enable cluster communications
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 41966 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 41967 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 41968 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 41969 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 50006 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 50007 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 50008 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 50009 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 21064 -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 6809  -j ACCEPT -s 10.10.3.0/24
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 14567 -j ACCEPT -s 10.10.3.0/24
# reject everything else
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
COMMIT

SMTP

25

tcp