How to Harden Windows Server 2012 R2 with CIS Benchmark Guidelines

August 8, 2019
Tutorials
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How to Harden Windows Server 2012 R2 with CIS Benchmark Guidelines The Center for Internet Security (CIS) publishes detailed hardening benchmarks for every major operating system, including Windows Server 2012 R2. Implementing the CIS Benchmark reduces your attack surface by disabling unnecessary services, tightening authentication policies, restricting dangerous protocols, and ensuring audit logging captures security-relevant […]

How to Set Up WireGuard VPN on RHEL 7

August 8, 2019
Linux
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How to Set Up WireGuard VPN on RHEL 7 WireGuard is a modern, high-performance VPN protocol built directly into the Linux kernel (from 5.6 onward) and available as a DKMS module on older kernels like those shipped with RHEL 7. Compared to OpenVPN and IPsec, WireGuard has a dramatically smaller codebase, faster handshake times, and […]

How to Set Up PostgreSQL Streaming Replication on Debian 9

August 7, 2019
Linux
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Introduction This guide explains how to Set Up PostgreSQL Streaming Replication 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 […]

How to Set Up Multi-Factor Authentication on Windows Server 2019

August 7, 2019
Tutorials
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Introduction to Multi-Factor Authentication Multi-Factor Authentication (MFA) requires users to provide two or more verification factors before gaining access: something they know (password), something they have (phone, hardware token, smart card), or something they are (biometrics). Implementing MFA on Windows Server 2019 dramatically reduces the risk of credential-based attacks—even if a password is stolen, an […]

Ubuntu 16.04 LTS Sudo Fails in Non-Interactive Automation

August 6, 2019
Linux
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🟡 Medium ⏱ 5–30 min Last verified: 6 August 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 & […]

Windows Server 2012 R2 — IIS W3SVC service fails after certificate change — Fix & Prevention

August 6, 2019
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🟠 High ⏱ 5–30 min Last verified: 6 August 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 […]

Windows Server 2019 — AD trust password broken between domains causing cross-domain auth failures — Fix & Prevention

August 6, 2019
Tutorials
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🟠 High ⏱ 5–30 min Last verified: 6 August 2019 Affected versions: Windows Server 2019 📖 ~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 […]

How to Install and Configure Nomad on Debian 9

August 6, 2019
Linux
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Introduction This guide explains how to Install and Configure Nomad 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 […]

How to Configure Chrony as a Time Server on RHEL 8

August 6, 2019
Linux
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Chrony is the recommended NTP implementation on RHEL 8, replacing the older ntpd daemon. In most deployments, each server simply synchronizes time from an upstream source, but promoting one server to act as a local NTP authority reduces external traffic and ensures that isolated hosts without internet access can still keep accurate time. This guide […]

sshd Fails to Start After Configuration Change

August 4, 2019
Tutorials
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🟡 Medium ⏱ 5–30 min Last verified: 4 August 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 […]

authentication

How to Harden Windows Server 2012 R2 with CIS Benchmark Guidelines

How to Set Up WireGuard VPN on RHEL 7

How to Set Up PostgreSQL Streaming Replication on Debian 9

How to Set Up Multi-Factor Authentication on Windows Server 2019

Ubuntu 16.04 LTS Sudo Fails in Non-Interactive Automation

Windows Server 2012 R2 — IIS W3SVC service fails after certificate change — Fix & Prevention

Windows Server 2019 — AD trust password broken between domains causing cross-domain auth failures — Fix & Prevention

How to Install and Configure Nomad on Debian 9

How to Configure Chrony as a Time Server on RHEL 8

sshd Fails to Start After Configuration Change

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