Troubleshooting

How to Configure Fail2Ban to Protect SSH on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Fail2Ban to Protect SSH on RHEL 7

How to Configure Fail2Ban to Protect SSH on RHEL 7 Even with SSH key-based authentication enabled, your server’s port 22 (or whatever port SSH is listening on) is constantly targeted by automated bots scanning the internet for open SSH services. These bots attempt thousands of login combinations per hour. While they cannot succeed against key-only […]

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Ubuntu 18.04 — freetds — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — freetds — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 19 December 2019 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4173-1 Related CVEs: CVE-2019-13508 Upstream summary: Felix Wilhelm discovered that FreeTDS incorrectly handled certain types after a protocol downgrade. A remote attacker could use this issue to cause FreeTDS to […]

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Oracle Linux 8 — WALinuxAgent — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — WALinuxAgent — vulnerability — patch and remediation guide (ELSA-2019-1527)

🟡 Medium   ⏱ 10–30 min  Last verified: 19 December 2019 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2019-1527 Related CVEs: CVE-2019-0804 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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How to Install pgAdmin 4 on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Install pgAdmin 4 on RHEL 8

pgAdmin 4 is the official open-source administration and development platform for PostgreSQL, providing a rich web interface for managing databases, running queries, monitoring activity, and visualizing schemas. On RHEL 8, the recommended installation path is the official PostgreSQL Global Development Group (PGDG) repository, which ships pgAdmin 4 as a dedicated web application package with a […]

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Common Problems 119064

Ubuntu 14.04 LTS rsyslog Stops Writing Logs

🟡 Medium   ⏱ 5–30 min  Last verified: 18 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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How to Set Up IBM Installation Manager on IBM AIX 7.1 — step-by-step IBM AIX 7.1 tutorial on Progressive Robot

How to Set Up IBM Installation Manager on IBM AIX 7.1

Introduction IBM AIX 7.1 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.1 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to set up ibm installation manager on ibm aix 7.1 […]

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How to Configure Postfix Mail Server on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Configure Postfix Mail Server on Debian 9

Introduction This guide explains how to Configure Postfix Mail Server 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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How to Configure DHCP Server on IBM AIX 7.2 — step-by-step IBM AIX 7.2 tutorial on Progressive Robot

How to Configure DHCP Server on IBM AIX 7.2

Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure dhcp server on ibm aix 7.2 on IBM […]

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FreeBSD 12 — lzo — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — lzo — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 18 December 2019 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: LZO — potential buffer overrun when processing malicious input data Related CVEs: CVE-2014-4608 Upstream summary: Markus Franz Xaver Johannes Oberhumer reports, in the package's NEWS file: Fixed a potential integer […]

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How to Audit File System Access on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Audit File System Access on Windows Server 2012 R2

How to Audit File System Access on Windows Server 2012 R2 File system auditing on Windows Server 2012 R2 creates a Security event log entry every time a specified file, folder, or registry key is accessed by a user or process. When properly configured, file system auditing provides forensic evidence for data breach investigations, satisfies […]

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