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Common Problems 114480

SSH Login Delay Caused by Reverse DNS Lookup

🟡 Medium   ⏱ 5–30 min  Last verified: 23 May 2025 📖 ~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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AlmaLinux 9 — pam — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 9

AlmaLinux 9 — pam — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 9 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2025:15099 Related CVEs: CVE-2025-6020 CVE-2025-8941 CVE-2024-10963 CVE-2024-10041 CVE-2024-22365 Upstream summary: Pluggable Authentication Modules (PAM) provide a system to set up authentication policies without the need to recompile programs to handle authentication. Security […]

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How to Configure WireGuard VPN on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Configure WireGuard VPN on CentOS Stream 10

Introduction How to Configure WireGuard VPN on CentOS Stream 10 on CentOS Stream 10 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is […]

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How to Configure HAProxy SSL Termination on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Configure HAProxy SSL Termination on CentOS Stream 10

Introduction This tutorial demonstrates how to Configure HAProxy SSL Termination on CentOS Stream 10 on CentOS Stream 10. It is written for administrators who want a repeatable, well-explained walkthrough that goes beyond a bare command list and explains each configuration choice. Every command is tested against a freshly registered CentOS Stream 10 system with the […]

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Common Problems 111624

Windows Server 2025 AD CS Certificate Enrollment Requests Fail — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 22 May 2025 Affected versions: Windows Server 2025 📖 ~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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openSUSE Leap 15.6 — pam_pkcs11 — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Leap 15.6

openSUSE Leap 15.6 — pam_pkcs11 — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Leap 15.6 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2025:0688-1 (see also SUSE bugzilla) Related CVEs: CVE-2025-24031 CVE-2025-24032 Upstream summary: PAM-PKCS#11 is a Linux-PAM login module that allows a X.509 certificate based user login. In versions 0.6.12 and prior, the […]

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How to Configure CentOS Stream 10 in Azure — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Configure CentOS Stream 10 in Azure

Introduction How to Configure CentOS Stream 10 in Azure on CentOS Stream 10 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is reproducible […]

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How to Configure Caddy Web Server on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Configure Caddy Web Server on CentOS Stream 10

Introduction How to Configure Caddy Web Server on CentOS Stream 10 on CentOS Stream 10 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration […]

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How to Install Packer for Machine Image Automation on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install Packer for Machine Image Automation on RHEL 9

HashiCorp Packer is an open-source tool for creating identical machine images for multiple platforms from a single configuration source. Rather than manually configuring servers after deployment, Packer bakes your configuration — packages, users, services, certificates — directly into the image at build time, embodying the immutable infrastructure pattern. The resulting AMIs, OVA files, or container […]

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How to Set Up a Web Application Firewall on CentOS Stream 10 — step-by-step CentOS Stream 10 tutorial on Progressive Robot

How to Set Up a Web Application Firewall on CentOS Stream 10

Introduction Setting up set up a web application firewall on centos stream 10 on a CentOS Stream 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Set Up a Web Application Firewall on CentOS Stream 10, with all the commands you need, the SELinux […]

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