Altiris requires ports:
67,68,69,401,402 & 4011. The rest of the ports altiris uses are dynamically assigned, according to the manual.
There are also tickle packets for tasks. These might be the ones you need.
Task Server Ports
* TCP Port 50120 (Task Server Data Loader)
* TCP Port 50121 (Altiris HTTP Server connection to host )
* TCP Port 50122 (Altiris HTTP Server connection to host)
* TCP Port 50123 (Tickle Server)
Task Server Client Ports
* 50124 (To receive Tickle Packets)
http://www.firsttech.co.za/altiris/ftp/Techy/Tech%20docs%20and%20utils/tech_docs/Deployment%20Server/Deployment%20Server%205_5%20Ports%20Whitepaper.pdf