Proxy

Common Problems 118620

Ubuntu 16.04 LTS – certificate verify failed due to outdated CA bundle – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 January 2022 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 Set Up Buildkite Agent on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up Buildkite Agent on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying set up buildkite agent on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Set Up Buildkite Agent on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the firewalld rules […]

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How to Install Icinga2 on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Install Icinga2 on CentOS Stream 9

Introduction CentOS Stream 9 ships with a stable, security-hardened base that makes deploying install icinga2 on centos stream 9 both straightforward and auditable. This tutorial covers the complete procedure for how to Install Icinga2 on CentOS Stream 9, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

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How to Set Up ModSecurity WAF on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Set Up ModSecurity WAF on CentOS Stream 9

Introduction This tutorial demonstrates how to Set Up ModSecurity WAF on CentOS Stream 9 on CentOS Stream 9. 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 9 system with the […]

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Common Problems 117582

Ubuntu 20.04 LTS Failing TLS Due to Expired CA Bundle

🟠 High   ⏱ 5–30 min  Last verified: 26 January 2022 Affected versions: 20.04 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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Common Problems 115533

RHEL 7 – Yum Hangs Behind Proxy with SSL Inspection

🟡 Medium   ⏱ 5–30 min  Last verified: 26 January 2022 📖 ~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 Install Jupyter Notebook on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install Jupyter Notebook on RHEL 8

Jupyter Notebook is an interactive computing environment that lets you combine live code, equations, visualizations, and narrative text in a single document. On RHEL 8, the recommended approach is to install Jupyter inside a Python virtual environment to keep the system Python clean. This tutorial covers installation, password protection, systemd service setup, and configuring Nginx […]

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How to Configure Buildah on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure Buildah on CentOS Stream 9

Introduction This tutorial demonstrates how to Configure Buildah on CentOS Stream 9 on CentOS Stream 9. 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 9 system with the default AppStream […]

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How to Configure Redis Sentinel on CentOS Stream 9 — step-by-step CentOS Stream 9 tutorial on Progressive Robot

How to Configure Redis Sentinel on CentOS Stream 9

Introduction This tutorial demonstrates how to Configure Redis Sentinel on CentOS Stream 9 on CentOS Stream 9. 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 9 system with the default […]

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How to Configure Nginx as a Reverse Proxy on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Configure Nginx as a Reverse Proxy on FreeBSD 13

Introduction How to Configure Nginx as a Reverse Proxy on FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 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 […]

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