Port 990 — FTPS control
Quick reference for TCP/UDP port 990, used by FTPS control. Includes what the service does, security guidance and related ports.
What is port 990?
FTP over TLS control channel.
What port does FTPS control use?
FTPS control listens on port 990 by default.
Is port 990 open? How to check
Run one of these from your computer, replacing HOST with the IP address or domain you want to test.
nc -zv HOST 990
Test-NetConnection HOST -Port 990
nmap -p 990 HOST
A refused or timed-out connection means the port is closed or filtered by a firewall.
Security guidance
Low risk — designed for public exposure
Port 990 (FTPS control) is designed for public exposure. Standard hardening (TLS certs, current firmware, sensible rate limits) is enough — no special isolation needed.
Related ports
Frequently asked
What is port 990 used for?+
Port 990 is the standard TCP/UDP port for FTPS control. FTP over TLS control channel.
What port does FTPS control use?+
FTPS control listens on port 990 by default.
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