Firewall at Zerops
Zerops includes a comprehensive firewall system implemented using nftables to ensure platform security.
The primary focus is on managing outbound communication to prevent potential platform misuse while maintaining the flexibility needed for legitimate applications.
What is a Firewall?​
A Firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
At Zerops, we implemented a robust firewall system to protect our platform and your applications.
Port Access Rules​
UDP Ports​
No restrictions
TCP Ports​
TCP ports 1-1024​
The following specific ports are allowed:
- 22 - SSH
- 53 - DNS
- 80 - HTTP
- 123 - NTP
- 443 - HTTPS
- 587 - SMTP (with STARTTLS)
All other TCP ports in the range 1-1024 are blocked for security reasons, see below.
TCP ports 1025-65535​
No restrictions
Security Measures​
These firewall rules are strategically implemented to:
- Prevent unauthorized use of the Zerops infrastructure for spam or network attacks
- Protect Zerops and its users from potential security threats
- Maintain compliance with security best practices
Common Use Cases​
Standard Web Applications (HTTP/HTTPS)​
- Full access to HTTP/HTTPS communication (ports 80/443)
- Unrestricted DNS queries (port 53)
- Time synchronization via NTP (port 123)
Email Services​
- SMTP access through port 587 (with STARTTLS)
- For detailed SMTP configuration, see our SMTP documentation
Requesting Firewall Modifications​
If your application requires access to additional ports:
- Contact Zerops support at support@zerops.io.
- Include in your request:
- Specific ports and protocols needed.
- Detailed explanation of your use case.
- Mention your Project ID and Organization ID from your Zerops Dashboard.