Proxy

Common Problems 118066

Ubuntu 18.04 LTS – snapd refresh stuck and snap applications fail to update – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 13 March 2020 Affected versions: Ubuntu 18.04 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 RADIUS Authentication with NPS on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up RADIUS Authentication with NPS on Windows Server 2012 R2

How to Set Up RADIUS Authentication with NPS on Windows Server 2012 R2 Network Policy Server (NPS) is Microsoft’s implementation of a RADIUS (Remote Authentication Dial-In User Service) server and proxy, included with Windows Server 2012 R2. NPS centralizes authentication, authorization, and accounting for network access—including VPN connections, 802.1X wired and wireless connections, dial-up connections, […]

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How to Set Up BranchCache on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Set Up BranchCache on Windows Server 2012 R2

How to Set Up IIS 8.5 Reverse Proxy on Windows Server 2012 R2 IIS 8.5 on Windows Server 2012 R2, combined with the Application Request Routing (ARR) extension and URL Rewrite module, creates a powerful reverse proxy platform that can load-balance web applications, forward requests to backend servers, terminate SSL, and provide WAF-like URL filtering. […]

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Common Problems 121679

Debian 9 TLS Handshake Failures to Repository or API Endpoints

🟠 High   ⏱ 5–30 min  Last verified: 2 March 2020 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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How to Set Up Active Directory Federation Services (AD FS) on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up Active Directory Federation Services (AD FS) on Windows Server 2019

How to Set Up Active Directory Federation Services (AD FS) on Windows Server 2019 Active Directory Federation Services (AD FS) provides Single Sign-On (SSO) capabilities, enabling users to authenticate once with their corporate credentials and access applications hosted in cloud services (Microsoft 365, Salesforce, Workday) or partner organizations without re-entering credentials. AD FS implements the […]

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How to Configure SELinux on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure SELinux on RHEL 7

How to Configure SELinux on RHEL 7 SELinux (Security-Enhanced Linux) is a mandatory access control (MAC) system built into the Linux kernel and enabled by default on every RHEL 7 installation. Unlike traditional Unix discretionary access control (DAC), which lets file owners decide who can access their files, SELinux enforces a policy defined by the […]

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Common Problems 118507

Ubuntu 16.04 LTS Apache2 fails to start because port 80 is in use

🟡 Medium   ⏱ 5–30 min  Last verified: 19 February 2020 📖 ~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 Deploy a Node.js Application with PM2 on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Deploy a Node.js Application with PM2 on RHEL 7

How to Deploy a Node.js Application with PM2 on RHEL 7 PM2 is a battle-tested production process manager for Node.js applications. It keeps your application running after a crash by restarting it automatically, provides integrated logging, enables zero-downtime reloads, supports cluster mode to utilize all CPU cores, and integrates with systemd for startup on boot. […]

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Common Problems 118530

Ubuntu 16.04 failed to fetch repository indexes

🟡 Medium   ⏱ 5–30 min  Last verified: 2 February 2020 📖 ~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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Common Problems 118087

Ubuntu 18.04 LTS – CA certificate trust chain errors break HTTPS endpoints – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 29 January 2020 Affected versions: Ubuntu 18.04 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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