Port 993 is used by IMAP Secure (SSL/TLS) (IMAPS). Encrypted IMAP email access. The secure version of port 143. Always use IMAPS/993 instead of IMAP/143 when configuring email clients.
What Does an Open Port 993 Mean?
An email server is accepting encrypted IMAP connections. This is the correct port for secure email access.
This port should NOT be open to the public internet on typical systems. If you see it open, investigate immediately.
Security Risk Level
Low Risk
How to Check if Port 993 Is Open
Use the ExamineIP Port Scanner to check if port 993 is open on any IP address from the public internet. Enter the target IP and select the relevant port preset.
How to Close Port 993
- Stop the service using port 993 if you no longer need it
- Add a firewall rule blocking inbound connections on port 993
- Check your router for port forwarding rules that expose this port
- Run
netstat -ano | findstr :993(Windows) to see which process is using it
Related Ports
IMAPS is related to: {implode(‘, ‘, Array)}
Protect Your Open Ports
If you need services like remote access, use a VPN to create a private encrypted tunnel instead of exposing ports directly to the internet. A VPN also hides your real IP address so port scanners cannot identify your device. Try PureVPN or IPVanish.