Backup Recovery

Common Problems 121503

Debian 9: SSH access denied after sshd Match rule change

🔴 Critical   ⏱ 5–30 min  Last verified: 22 August 2019 Affected versions: Debian 9 📖 ~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 & […]

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Common Problems 115083

RHEL 8 rsyslog cannot forward logs over TLS

🟡 Medium   ⏱ 5–30 min  Last verified: 22 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 […]

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How to Configure Apache2 MPM Worker on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Apache2 MPM Worker on Debian 9

Introduction Deploying configure apache2 mpm worker 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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Common Problems 115002

RHEL 8 sudo Commands Pause for DNS Lookup Delays

🟡 Medium   ⏱ 5–30 min  Last verified: 22 August 2019 Affected versions: 8.4 8.5 8.6 8.7 8.8 8.9 8.10 📖 ~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 […]

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Common Problems 113611

Windows Server 2012 R2 — Credential Manager service vault access errors — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 22 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 […]

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How to Perform a System State Backup on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Perform a System State Backup on Windows Server 2016

How to Set Up System State Backup and Bare Metal Recovery on Windows Server 2016 Protecting a Windows Server 2016 installation requires more than simply backing up user data. The operating system itself, including the registry, the Active Directory database, boot files, and the COM+ class registration database, must be captured in what is known […]

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Common Problems 118471

Ubuntu 16.04 LTS – apt update fails with 404 Not Found for package index – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 21 August 2019 Affected versions: Ubuntu 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 […]

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How to Configure pf Firewall Rules on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure pf Firewall Rules on FreeBSD 12

Introduction How to Configure pf Firewall Rules 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 […]

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Common Problems 113041

Windows Server 2016 — RDS Session Host Patch Fails Due to Active User Session Locks — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 21 August 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 […]

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How to Install Go on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Go on Debian 9 (DEBIAN-9-2)

Introduction Debian 9 Stretch is built around the ethos of stability and free software. Setting up install go on debian 9 on Stretch leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Stretch freeze. Follow each step carefully and the resulting […]

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