Port 993 · IMAPS

Port 993 is IMAPS, TCP.

IMAP over TLS — encrypted email retrieval and sync. Messages stay on the server; plain IMAP uses 143.

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-993 protocol tcp port 993

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application imap service tcp-993 action allow

Risk and exposure

Rated low risk. Even so, only expose this port to the networks and hosts that need it, and keep it patched.

Check it

• Linux ss -tlnp | grep :993
• PowerShell Test-NetConnection <host> -Port 993
• nmap nmap -p 993 <host>

Related ports

• 143 IMAP
• 123 NTP
• 873 rsync
• 25 SMTP
• 110 POP3
• 465 SMTPS

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