Troubleshooting

FreeBSD 12 — linux-flock — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — linux-flock — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 10 December 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: mozilla — multiple vulnerabilities Related CVEs: CVE-2007-4879 CVE-2007-5959 CVE-2008-0016 CVE-2008-0412 CVE-2008-0413 CVE-2008-0414 CVE-2008-0415 CVE-2008-0417  +12 more Upstream summary: The Mozilla Foundation reports: MFSA 2008-37 UTF-8 URL stack buffer overflow MFSA […]

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Amazon Linux 2 — python-crypto — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — python-crypto — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2ANSIBLE2-2024-011 Related CVEs: CVE-2013-7459 CVE-2018-6594 Upstream summary: Heap-based buffer overflow in the ALGnew function in block_templace.c in Python Cryptography Toolkit (aka pycrypto) allows remote attackers to execute arbitrary code as […]

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How to Set Up Network Monitoring on Windows Server 2016 — step-by-step Windows Server 2016 tutorial on Progressive Robot

How to Set Up Network Monitoring on Windows Server 2016

How to Set Up Windows Server 2016 Network Monitoring Network monitoring is a critical component of maintaining a healthy and secure Windows Server 2016 environment. Without visibility into network traffic, bandwidth utilization, device availability, and performance metrics, administrators are essentially flying blind. Problems may go undetected until they cause outages, and capacity planning becomes guesswork. […]

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Common Problems 118567

Ubuntu 16.04 LTS TLS handshake failures due to outdated CA trust

🟡 Medium   ⏱ 5–30 min  Last verified: 9 December 2019 📖 ~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 118470

Ubuntu 16.04 disk space fills up unexpectedly

🟡 Medium   ⏱ 5–30 min  Last verified: 9 December 2019 📖 ~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 113411

Windows Server 2012 R2 — Password change rejected with policy mismatch even though it meets stated requirements — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 9 December 2019 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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How to Configure iptables Packet Filtering on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure iptables Packet Filtering on Debian 9

Introduction This guide explains how to Configure iptables Packet Filtering on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with the […]

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FreeBSD 12 — pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — pure-ftpd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 December 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: pureftpd — multiple vulnerabilities Related CVEs: CVE-2011-0418 CVE-2011-1575 Upstream summary: Pure-FTPd development team reports: Support for braces expansion in directory listings has been disabled — Cf. CVE-2011-0418. Fix a STARTTLS […]

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

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

🟢 Low   ⏱ 5–15 min  Last verified: 9 December 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: miniupnpc — integer signedness error Related CVEs: CVE-2015-6031 CVE-2017-8798 Upstream summary: Tintinweb reports: An integer signedness error was found in miniupnp's miniwget allowing an unauthenticated remote entity typically located on […]

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How to Automate Backups with rsync and cron on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Automate Backups with rsync and cron on RHEL 7

How to Automate Backups with rsync and cron on RHEL 7 Reliable backups are the foundation of any serious system administration strategy. On RHEL 7, rsync combined with cron provides a powerful, scriptable, and highly efficient backup solution that requires no commercial software or complex infrastructure. rsync transfers only changed file blocks over the network, […]

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