authentication

Windows Server 2016 — DHCP scope exhaustion caused by stale reservations and delayed lease reclamation — Fix & Prevention

• December 23, 2019
• Tutorials
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🟠 High   ⏱ 5–30 min  Last verified: 23 December 2019 Affected versions: Windows Server 2016 📖 ~2 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 […]

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How to Configure Docker Logging Drivers on Debian 9

• December 23, 2019
• Linux
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Introduction This guide explains how to Configure Docker Logging Drivers on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with the […]

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How to Set Up Capistrano Deployment on Debian 9

• December 22, 2019
• Linux
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Introduction Deploying set up capistrano deployment on debian 9 on a Debian 9 Stretch machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Before you […]

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How to Configure Apache2 Virtual Hosts on Debian 9

• December 21, 2019
• Linux
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Introduction Deploying configure apache2 virtual hosts on debian 9 on a Debian 9 Stretch machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Ensure Debian […]

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NTP Drift Causes Authentication and TLS Errors

• December 21, 2019
• Tutorials
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🟡 Medium   ⏱ 5–30 min  Last verified: 21 December 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 […]

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How to Set Up Two-Factor Authentication for SSH with Google Authenticator on RHEL 7

• December 21, 2019
• Linux
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How to Set Up Two-Factor Authentication for SSH with Google Authenticator on RHEL 7 Password-based SSH authentication is vulnerable to brute-force attacks, credential stuffing, and phishing. Adding a second authentication factor — a time-based one-time password (TOTP) generated by an app like Google Authenticator or Authy — dramatically reduces this risk. Even if an attacker […]

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Windows Server 2012 R2 — SQL Server service account permission regression — Fix & Prevention

• December 20, 2019
• Tutorials
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🟠 High   ⏱ 5–30 min  Last verified: 20 December 2019 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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How to Perform a System Security Audit with auditd on RHEL 8

• December 20, 2019
• Linux
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The Linux Audit system (auditd) provides a comprehensive security logging framework that records system calls, file accesses, and user actions at the kernel level. On RHEL 8, auditd is installed and enabled by default, making it a foundational component of any security compliance strategy. Whether meeting requirements for PCI-DSS, HIPAA, or internal policy, audit rules […]

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How to Configure Scale-Out File Server (SoFS) on Windows Server 2012 R2

• December 19, 2019
• Tutorials
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How to Configure Scale-Out File Server (SoFS) on Windows Server 2012 R2 Scale-Out File Server (SoFS) is a Failover Cluster role in Windows Server 2012 R2 that provides continuously available file shares using SMB 3.0. Unlike a traditional File Server Failover Cluster role — where one node actively serves files while others stand by — […]

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How to Install and Configure FreeIPA on RHEL 7

• December 19, 2019
• Linux
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How to Install and Configure FreeIPA on RHEL 7 FreeIPA is an integrated identity and authentication solution that combines LDAP (via 389 Directory Server), Kerberos, DNS, a certificate authority (Dogtag PKI), and a web-based management interface into a single coherent platform. It is Red Hat’s upstream open-source project that underpins Red Hat Identity Management (IdM), […]

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