Port 990 · FTPS

Port 990 is FTPS, TCP.

FTP over implicit TLS — encrypted file transfer. Not to be confused with SFTP, which runs over SSH.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-990 protocol tcp port 990

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ftp service tcp-990 action allow

Risk and exposure

Rated medium risk. Restrict this port to the sources that need it and keep the service patched; avoid exposing it to the whole internet unless the service is meant to be public.

Check it

• Linux ss -tlnp | grep :990
• PowerShell Test-NetConnection <host> -Port 990
• nmap nmap -p 990 <host>

Related ports

• 20 FTP Data
• 21 FTP Control
• 873 rsync
• 443 HTTPS
• 636 LDAPS
• 5061 SIP TLS

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