Note that on UNIX-based systems binding to any port under 1024 requires root privliges, which Servoy does not have. Running Servoy as root is strongly advised against.
There are many ways to solve this problem, two easy solutions:
1) Use of firewall software to redirect port 80 to port 8080
2) Use of a webserver (e.g. apache)/proxy software to forward port 80 to port 8080