Understanding Raw Print Servers: A Beginner’s Guide

Securing Your Raw Print Server: Best Practices and Tips

Raw print servers forward print data directly to printers over a network without protocol translation, making them fast but potentially risky if left unsecured. Below are practical, prioritized steps to harden a raw print server and reduce attack surface while maintaining reliable printing.

1. Inventory and minimize exposure

• Identify devices: List all raw print servers, IP addresses, hostnames, and the printers they serve.
• Remove unused services: Disable any unnecessary services or ports on the server (e.g., FTP, Telnet, SMB if not needed).
• Limit network exposure: Place print servers on a dedicated VLAN or subnet to isolate them from critical systems.

2. Network-level controls

• Firewall rules: Allow only necessary source IPs and ports (typically TCP 9100 for raw printing). Block all other traffic to the print server.
• Access control lists (ACLs): Apply ACLs on switches/routers to restrict which segments can reach the print server.
• Segmentation: Use network segmentation and internal firewalls to separate user workstations, servers, and printers.

3. Authentication and access management

• Restrict admin access: Limit administrative logins to specific management workstations and use SSH with key-based authentication where possible.
• Role-based access: Use least-privilege accounts for configuration or management tasks.
• Audit accounts: Regularly review accounts with access and remove stale or shared credentials.

4. Encryption and secure transport

• Use secure channels for management: Use SSH, HTTPS, or a management API over TLS for configuration and monitoring.
• Avoid sending sensitive data in plain text: Do not transmit credentials or confidential print jobs over unencrypted channels.

5. Hardening the server and firmware

• Patch promptly: Keep the server OS, print server firmware, and printer firmware updated with security patches.
• Harden OS configuration: Disable unused services, enforce strong password policies, enable local firewalling, and apply security baselines.
• Immutable configurations: Where possible, use configuration management to enforce and version control print server settings.

6. Logging, monitoring, and alerting

• Enable detailed logging: Log connections, administrative changes, and print job metadata (without storing sensitive document contents).
• Centralize logs: Send logs to a centralized SIEM or log server for retention and correlation.
• Monitor for anomalies: Alert on unusual volumes of print jobs, connections from unexpected IPs, or repeated failed admin logins.

7. Protect print job content

• Print job handling: If sensitive documents are printed, route jobs through secure print release or pull-print systems that require user authentication at the printer.
• Data retention: Configure servers and printers not to store job content longer than necessary; clear job buffers after completion.
• Secure disposal: Ensure any stored logs or cached print files are securely deleted per policy.

8. Physical security

• Restrict physical access: Place print servers and networked printers in secure rooms or locked cabinets.
• Protect console access: Prevent direct console access to servers and printers by locking ports or disabling unused interfaces.

9. Backup and recovery

• Configuration backups: Regularly back up print server configurations and firmware images.
• Disaster recovery plan: Include print services in business continuity plans and document restoration steps.

10. Policy, training, and periodic review

• Usage policy: Define acceptable printing practices and prohibit printing highly sensitive data unless safeguards are used.
• Admin training: Train administrators on secure configuration and incident response specific to print infrastructure.
• Regular reviews: Conduct periodic