Appendix B: Port Numbers
 
Appendix B: Port Numbers
Communications between the FortiADC system, clients, servers, and FortiGuard Distribution Network (FDN) require that any routers and firewalls between them permit specific protocols and port numbers.
The following tables list the default port assignments used by the FortiADC system.
Table 91: Default ports used by FortiADC for outgoing traffic
Port Number
Protocol
Purpose
N/A
ARP
HA failover of network interfaces.
N/A
ICMP
• Server health checks.
• execute ping and execute traceroute
25
TCP
SMTP for alert email.
53
UDP
DNS queries.
69
UDP
TFTP for backups, restoration, and firmware updates. See commands such as execute backup or execute restore.
80
TCP
Server health checks.
123
UDP
NTP synchronization.
162
UDP
SNMP traps.
443
TCP
• FortiGuard polling.
• Server health checks.
514
UDP
Syslog.
6055
UDP
HA heartbeat. Layer 2 multicast.
6056
UDP
HA configuration synchronization. Layer 2 multicast.
Table 92: Default ports used by FortiADC for incoming traffic (listening)
Port Number
Protocol
Purpose
N/A
ICMP
ping and traceroute responses.
22
TCP
SSH administrative CLI access.
23
TCP
Telnet administrative CLI access.
53
UDP
DNS queries from clients for global load balancing and inbound link load balancing.
80
TCP
• HTTP administrative web UI access.
• Predefined HTTP service. Only occurs if the service is used by a virtual server.
161
UDP
SNMP queries.
443
TCP
• HTTPS administrative web UI access. Only occurs if the destination address is a network interface’s IP address.
• Predefined HTTPS service. Only occurs if the service is used by a virtual server, and if the destination address is a virtual server.
6055
UDP
HA heartbeat. Layer 2 multicast.
6056
UDP
HA configuration synchronization. Layer 2 multicast.