Troubleshooting

How to Manage Systemd Services and Units on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Manage Systemd Services and Units on RHEL 8

Systemd is the default init system on Red Hat Enterprise Linux 8, responsible for managing services, sockets, timers, and other units from boot through shutdown. Understanding how to control systemd services is essential for anyone administering RHEL 8 servers in production. This tutorial covers the core systemctl commands, how to inspect logs with journalctl, and […]

Read more
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 […]

Read more
How to Configure Disk Quotas on FreeBSD 12 — step-by-step FreeBSD 12 tutorial on Progressive Robot

How to Configure Disk Quotas on FreeBSD 12 (FREEBSD-12-2)

Introduction This guide explains how to Configure Disk Quotas on FreeBSD 12 on FreeBSD 12. 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 privilege […]

Read more
FreeBSD 12 — lesstif — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — lesstif — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 2 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: xpm — image decoding vulnerabilities Related CVEs: CVE-2004-0687 CVE-2004-0688 Upstream summary: Chris Evans discovered several vulnerabilities in the libXpm image decoder: A stack-based buffer overflow in xpmParseColors An integer overflow […]

Read more
Common Problems 115526

RHEL 7 firewalld Zone Mismatch on Primary NIC

🟡 Medium   ⏱ 5–30 min  Last verified: 2 February 2020 Affected versions: RHEL 7 📖 ~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 & […]

Read more
FreeBSD 12 — libgcrypt — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — libgcrypt — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 2 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: libgcrypt — ECDSA timing attack Related CVEs: CVE-2013-4242 CVE-2015-7511 CVE-2016-6313 CVE-2017-0379 CVE-2017-7526 CVE-2018-0495 CVE-2019-13627 Upstream summary: GnuPG reports: Mitigate an ECDSA timing attack. Table of contents Symptom & Impact Environment […]

Read more
Alpine Linux edge — binutils-cross-embedded — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — binutils-cross-embedded — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 2.37-r0 📖 ~4 min read  •  Source: Alpine secdb entry — binutils-cross-embedded 2.37-r0 Related CVEs: CVE-2020-35448 Upstream summary: Alpine community repository for vedge ships binutils-cross-embedded 2.37-r0 which addresses CVE-2020-35448. Table of contents Symptom & Impact Environment […]

Read more
FreeBSD 12 — egroupware — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — egroupware — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 2 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: egroupware — two vulnerabilities Related CVEs: CVE-2005-1202 CVE-2005-1203 Upstream summary: Egroupware Team report: Nahuel Grisolia from CYBSEC S.A. Security Systems found two security problems in EGroupware: Serious remote command execution […]

Read more
How to Set Up Nginx with PHP-FPM on Debian 10 — step-by-step Debian 10 tutorial on Progressive Robot

How to Set Up Nginx with PHP-FPM on Debian 10

Introduction Debian 10 Buster is built around the ethos of stability and free software. Setting up set up nginx with php-fpm on debian 10 on Buster leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Buster freeze. Follow each step carefully […]

Read more
FreeBSD 12 — amaya — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — amaya — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 2 February 2020 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: amaya — multiple buffer overflow vulnerabilities Related CVEs: CVE-2006-1900 CVE-2008-5282 CVE-2009-0323 Upstream summary: Secunia reports: A boundary error when processing "div" HTML tags can be exploited to cause a stack-based […]

Read more
CHAT