August 2021 - Page 52 of 69

Common Problems 117600

Ubuntu 20.04 LTS APT GPG Signature Verification Failed

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 📖 ~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 112633

Windows Server 2019 — Jumbo frame MTU mismatch across virtual and physical switches fragments storage traffic — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 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 […]

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How to Install Caddy Web Server on FreeBSD 13 — step-by-step FreeBSD 13 tutorial on Progressive Robot

How to Install Caddy Web Server on FreeBSD 13

Introduction This guide explains how to Install Caddy Web Server on FreeBSD 13 on FreeBSD 13. FreeBSD uses the pkg(8) binary package manager, rc.conf(5) for service startup configuration, and pf(4) as its primary packet filter. There is no SELinux or AppArmor — instead, FreeBSD provides the MAC (Mandatory Access Control) framework and Capsicum for fine-grained […]

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How to Configure IPsec Transport Mode for Server-to-Server Encryption on Windows Server 2016 — Windows Server 2016 tutorial on Progressive Robot

How to Configure IPsec Transport Mode for Server-to-Server Encryption on Windows Server 2016

Introduction IPsec Transport Mode encrypts traffic directly between two Windows Server 2016 hosts without requiring a VPN gateway or tunnel infrastructure. Unlike IPsec Tunnel Mode (used in site-to-site VPNs), Transport Mode encrypts only the data payload of each IP packet, leaving the original IP headers intact. This makes Transport Mode ideal for server-to-server communication within […]

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FreeBSD 13 — metamail — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — metamail — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: metamail format string bugs and buffer overflows Related CVEs: CVE-2004-0104 CVE-2004-0105 Upstream summary: Ulf Härnhammar reported four bugs in metamail: two are format string bugs and two are buffer overflows. […]

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How to Set Up Software RAID with mdadm on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Install Prometheus and Grafana on Ubuntu 26.04

Prometheus is an open-source metrics collection and alerting system, while Grafana provides beautiful dashboards for visualising those metrics. Together they form the most popular open-source monitoring stack. This guide installs both on Ubuntu 26.04 LTS with Nginx and SSL. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS with Nginx installed A user […]

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FreeBSD 13 — libgd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — libgd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: libgd — Denial of servica via double free Related CVEs: CVE-2017-6362 CVE-2017-7890 Upstream summary: libgd developers report: Double free vulnerability in the gdImagePngPtr function in libgd2 before 2.2.5 allows remote […]

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Использование буферов в Node.js — step-by-step Javascript tutorial on Progressive Robot

Использование буферов в Node.js

Автор выбрал COVID-19 Relief Fund для получения пожертвования в рамках программы Write for DOnations. Буфер — пространство в памяти (как правило, оперативной), в котором…

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How to Configure Log Rotation with logrotate on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Log Rotation with logrotate on RHEL 7

How to Configure Log Rotation with logrotate on RHEL 7 Log files are essential for diagnosing system problems, tracking security events, and auditing application behavior. However, without proper management, log files grow without bound and can fill your disk, causing service outages and making historical logs difficult to navigate. logrotate is the standard log rotation […]

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