Is POP3 TCP or UDP

CommuniGate Pro ports and firewalls

CommuniGate Pro uses different ports for its services, which have to be activated by a firewall rule.

The following ports are active with the default setup of CommuniGate Pro.

1) Ports for incoming traffic

Port number / service [IP protocol]

  • 21 FTP [TCP]
  • 22 FTP DATA [UDP, TCP]
  • 25 SMTP [TCP]
  • 53 DNS [UDP, TCP] (only for DNS server traffic)
  • 69 TFTP [UDP] (for “Trusted” networks, intranet)
  • 80 HTTP [TCP] (WebMail)
  • 110 POP [TCP]
  • 143 IMAP [TCP]
  • 387 LDAP [TCP] (for “Trusted” networks, intranet)
  • 443 HTTPS [TCP]
  • 465 SMTP SSL [TCP] (Microsoft only)
  • 587 SMTP MSP [TCP]
  • 636 LDAPS [TCP]
  • 674 ACAP [TCP] (for “Trusted” networks, intranet)
  • 993 IMAPS [TCP]
  • 995 POP3S [TCP]
  • 5060 SIP [UDP, TCP]
  • 5061 SIPS [TCP, UDP]
  • 5222 XMPP [TCP, UDP] (Jabber)
  • 5223 XMPP SSL [TCP, UDP] (Jabber / XMPP Encryption)
  • 8010 WebAdmin Interface [TCP]
  • 8021 FTP [TCP]
  • 8100 WebUser Interface [TCP] (WebMail default)
  • 9010 WebAdmin Interface Encrypted [TCP]
  • 9100 WebUser Interface Encrypted [TCP] (WebMail default)
  • 11024 XIMSS [TCP, UDP]
  • 11025 XIMSS SSL [TCP, UDP]
  • 60000-60099 RTP [TCP, UDP]

2) Ports for outbound traffic


All “source ports” should be open and access should be allowed. MUAs (Mail User Agents) and SIP UAs (User Agents) can use any port for the data connection. Clusters should also be allowed to send data from any port to any port.

All outgoing traffic should be allowed on the firewall using the “Keep State” method so that incoming reply packets are not blocked.

3) Inter-cluster ports
The CommuniGate Pro Dynamic Cluster communicates (by default) via these ports. IMPORTANT NOTE: Please keep the network between the cluster nodes as simple as possible. This includes eliminating VIPs and firewalls * between cluster nodes * whenever possible to minimize the risk of network failures. Even brief errors of less than 1 second can cause cluster nodes to be disconnected from the cluster if the TCP connections (on port 106) are lost.

Inter-Cluster Port Number / Service [IP Protocol]

  • 21 FTP [TCP]
  • 25 SMTP [TCP]
  • 69 TFTP [UDP]
  • 80 HTTP [TCP]
  • 106 CGP CLI / API [TCP]
  • 110 POP [TCP]
  • 143 IMAP [TCP]
  • 387 LDAP [TCP]
  • 674 ACAP [TCP]
  • 5060 SIP [UDP, TCP]
  • 5222 XMPP [TCP]
  • 8010 HTTP [TCP]
  • 8021 FTP [TCP]
  • 8100 HTTP [TCP]
  • 9010 HTTPS [TCP]
  • 9100 HTTPS [TCP]
  • 11024 XIMSS [TCP]