Backup Exec Desktop and Laptop Option ports
You may have special port requirements for Backup Exec if you use a firewall. Firewalls sometimes affect system communications between a media server and remote systems that reside outside the firewall environment.
See About using Backup Exec with firewalls.
The Backup Exec Desktop and Laptop Option (DLO) uses the following ports:
Table: Backup Exec Desktop and Laptop Option Ports
Service or Process
Server Message Block (SMB) communication
Server Message Block (SMB) communication without NETBIOS
DLOAdminSvcu.exe (DLO admin service)
3999 in listening mode