Port Assignments
From Roaring Penguin
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.