Port

Port 990

Conventionally used by FTPS. Port assignments are conventions, so confirm the actual listener before you write a rule around this number.

TCPEncrypted: Yes

Protocols on this port

FTPS

FTP over TLS

Security: Complex firewall behaviour; SFTP is usually simpler

TCP · Encrypted: Yes

Where this port appears in the documentation

TLS

Transport Layer Security provides confidentiality, integrity and server authentication for application traffic, most visibly as HTTPS.

Exposure guidance

Decide reachability from the identity of the caller, not from the port number. If the service on this port carries credentials or administrative control, restrict it to an administrative network, require strong authentication, and log every session that reaches it.

Nearby ports

Port 853 Port 993

In the knowledge graph

Open the interactive map centred on this entity to see everything it connects to and travel outwards from there.

Explore port 990 in the knowledge graph