Nmap


┌──(kali㉿kali)-[~/archive/htb/labs/shibboleth]
└─$ sudo nmap -sU -top-ports 100 $IP 
starting nmap 7.93 ( https://nmap.org ) at 2023-04-17 17:14 CEST
Nmap scan report for shibboleth.htb (10.10.11.124)
Host is up (0.093s latency).
not shown: 99 closed udp ports (port-unreach)
PORT    STATE SERVICE
623/udp open  asf-rmcp
 
nmap done: 1 IP address (1 host up) scanned in 95.96 seconds

Performing a UDP scan followed by a regular TCP port scan The port 623 is open and clams to be the asf-rmcp service