For CCBoot default ports information, you can also refer to "CCBoot Server Ports" in CCBoot v3.0 Wiki.

iSCSI: TCP 3260

DHCP: UDP 67 and 66

TFTP: UDP 69

Image Upload: TCP 1000

Service Control: 8001

If you have installed antivirus software or firewall on CCBoot server, please make sure these ports are available.