The ports required to be open on a CSN are:

Interface	Type	Required/Optional
SCSP	UDP/80	Required for writing through the front end proxy
Web Console	TCP/8090	Required for management
DHCP	UDP/67	Required for netboot
DNS	UDP/53	Optional
NTP	UDP/123	Required
Logging	UDP/514	Required
SNMP	UDP/161	Optional but recommended
mDNS	UDP/5353	Optional but highly recommended
TFTP	UDP/69	Required for netboot
SwarmUI	TCP/91	Required if using Service Proxy/ Swarm Management UI in CSN 8.3+

This information may be helpful when configuring your firewall so is reprinted here.

This information may be helpful when configuring your firewall so is reprinted here.

Browser not supported