APROL R 4.4-65 combines system hardening, secure communication, access control and continuous lifecycle management to support the availability, reliability and safety of industrial control systems.
Security from installation onward
APROL reduces the potential attack surface through system hardening with a minimum number of enabled ports and services. Additional measures include kernel-level security functions, UEFI Secure Boot, USBGuard with allow- and block-list capabilities, network segmentation into security zones, and a preconfigured personal firewall with IP allowlists.
Authentication can be integrated with LDAP. Role-based access control manages authorization for users and operators, while security-relevant operations are logged to provide accountability and support auditing. Embedded web-based remote diagnostics complement these capabilities.
Encrypted industrial communication
TLS-based encryption protects communication across the process-control and controller networks. Supported protocols and services include ANSL, MQTT, OPC UA, HTTP, FTP and mapp View. A Public Key Infrastructure and a common certificate store provide centralized support for certificates and trusted communication. APROL also incorporates the Advanced Intrusion Detection Environment, AIDE.
Predictable lifecycle and patch management
APROL follows a defined maintenance cycle for both the APROL system software and its SUSE Linux-based general-purpose operating system:
- Annual APROL builds, such as R 4.4-65
- Quarterly APROL patches, such as R 4.4-65 P1
- Monthly Linux AutoYaST updates
- Daily Linux updates for internal evaluation
This structured approach helps operators maintain a controlled and up-to-date system throughout the active and classic phases of the product lifecycle.
Transparent technology stack
The APROL R 4.4 technology stack dated July 2026 is based on SUSE Linux Enterprise Server 15 SP7 with kernel 6.4.0. It incorporates established technologies including Apache, OpenSSL, OpenSSH, KVM, Docker/Moby, TimescaleDB, MariaDB, the OPC UA C++ SDK, Paho MQTT and GnuTLS.
APROL and the Linux-based general-purpose operating system are supplied as a bundle but delivered on separate ISO media. Software bills of materials are provided for APROL and SUSE Linux software, supplemented by an AutoYaST notice report containing component versions, license information and source-code information where applicable.
CIS benchmarks as a hardening reference
CIS benchmarks provide technical configuration guidance designed to maintain or improve the security of deployed technologies. Relevant benchmarks cover SUSE Linux Enterprise Server 15, Docker, Apache HTTP Server 2.4, MariaDB 10.6 and PostgreSQL 16.
These configuration recommendations complement essential cybersecurity activities such as monitoring the base operating system, applications and libraries for vulnerabilities and applying current security updates promptly.
APROL R 4.4-65 therefore delivers cybersecurity as a coordinated system capability—from hardened installation and protected communication to transparent software composition and continuous maintenance.