Port Assignments

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This list may help:

Communication with external servers:

  • inbound port 25 mail
  • inbound port 22 SSH administration
  • outbound port 53 DNS lookups
  • outbound port 80,
  • outbound port 443 RPTN, s/w updates, Clam virus sigs
  • outbound port 123-UDP Network Time Protocol
  • outbound port 6568-UDP Reputation submission

Communication with internal servers:

  • *in/out port 22 Intra-cluster C & C
  • *in/out port 5432 Intra-cluster database traffic
  • *in/out port 6568-TCP Intra-cluster storage manager traffic
  • *outbound port 389 LDAP lookups
  • *outbound port 636 LDAPS lookups
  • *outbound port 110,995 POP3 lookups
  • *outbound port 143,993 IMAP lookups
  • outbound port 25 Verification server, mail delivery

Those marked with an asterisk may or may not be used depending on your configuration.