Introduction How to Configure OpenDKIM with Postfix on FreeBSD 12 is a core administration task for any FreeBSD 12 server operator. FreeBSD 12 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet […]
Introduction to DNS Security on Windows Server 2019 DNS is foundational infrastructure — every name resolution request on your network passes through it. A misconfigured or compromised DNS server can redirect traffic, enable phishing attacks, or facilitate data exfiltration. Windows Server 2019 includes several built-in features to harden DNS, including DNSSEC, Response Rate Limiting (RRL), […]
🟠 High ⏱ 5–30 min Last verified: 21 November 2019 Affected versions: 16.04 LTS 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]
🟠 High ⏱ 5–30 min Last verified: 21 November 2019 Affected versions: Windows Server 2016 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution — Primary Fix Solution — Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors […]
Introduction FreeBSD 12 is a UNIX-derived operating system renowned for its network stack performance, ZFS integration, and Jail isolation primitives. Setting up set up fail2ban on freebsd 12 on FreeBSD 12 follows the rc.conf/service(8) paradigm rather than systemd, which means enabling a service and configuring its startup options are done differently from any Linux distribution. […]
How to Configure Windows Server 2016 Remote Desktop Connection Broker Remote Desktop Connection Broker (RD Connection Broker) is the intelligence layer in a Windows Server 2016 Remote Desktop Services deployment. It manages session reconnection, load balancing across multiple RD Session Host servers, and publishing of RemoteApp programs and virtual desktops from a centralised collection. Without […]
🟡 Medium ⏱ 10–30 min Last verified: 21 November 2019 Affected versions: SLES 15 📖 ~4 min read • Source: SUSE advisory openSUSE-SU-2011:1161-1 (see also SUSE bugzilla) Related CVEs: CVE-2011-3581 Upstream summary: Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before 1.6.11 allows remote attackers to cause a denial of service (crash) and […]
Introduction How to Configure RAID with mdadm on Debian 9 is a fundamental operation for any administrator maintaining a Debian 9 Stretch server. Debian 9 Stretch ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian 9. […]
🟡 Medium ⏱ 5–30 min Last verified: 19 November 2019 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & Cross-Refs References & Further […]
WireGuard is a modern, high-performance VPN protocol built into the Linux kernel since version 5.6, offering significantly simpler configuration and better performance than older alternatives like OpenVPN or IPsec. On RHEL 8, WireGuard can be installed via the ELRepo kernel module or the wireguard-tools package from EPEL, with the kernel module provided by the elrepo-kernel […]
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