21/tcp open ftp | fingerprint-strings: | GenericLines: | 220 ProFTPD Server (ftp.int.inlanefreight.htb) [10.129.88.20]
22/tcp open ssh OpenSSH 8.2p1 Ubuntu 4ubuntu0.2 (Ubuntu Linux; protocol 2.0)
53/tcp open domain ISC BIND 9.16.1 (Ubuntu Linux) | dns-nsid: |_ bind.version: 9.16.1-Ubuntu
2121/tcp open ftp | fingerprint-strings: | GenericLines: | 220 ProFTPD Server (Ceil’s FTP) [10.129.88.20]
Method : Use creds given to login to ftp:2121 and get the ssh private keys, then ssh to get the flag