TCP 2121
Synopsis
- CCProxy’s FTP proxy service uses TCP port 2121 (IANA service name: ccproxy-ftp); banners often show “CCProxy FTP Proxy ready.”
- 3proxy’s ftppr (FTP proxy) is commonly deployed on 2121 in its example and community configurations.
- SlimFTPd, a lightweight Windows FTP server, defaults to listening on port 2121.
- The Python pyftpdlib project’s example FTP servers frequently use 2121 to avoid privileged-port requirements and are seen in real deployments.
- Various embedded/edge devices and appliances ship with FTP services bound to 2121 (often via bundled lightweight FTP daemons or proxies), as observed in internet scans and vendor images.
- Security note: Because 2121 is widely used for FTP/proxy services, attackers routinely scan and brute-force it, and misconfigured FTP proxies (e.g., CCProxy/3proxy) can be abused for relaying or pivoting.
Observed activity
Last 30 days
Detailed chart