2022 - Page 15 of 842

Common Problems 117069

Ubuntu 22.04 LTS – sudo fails because hostname cannot be resolved

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 22.04 LTS Ubuntu 22.04 Ubuntu 22.04.4 📖 ~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 […]

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Debian 11 — libyang — multiple vulnerabilities (18 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — libyang — multiple vulnerabilities (18 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-19333 CVE-2019-19334 CVE-2019-20391 CVE-2019-20392 CVE-2019-20393 CVE-2019-20394 CVE-2019-20395 CVE-2019-20396  +10 more Upstream summary: In all versions of libyang before 1.0-r5, a stack-based buffer overflow was discovered in the way […]

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Common Problems 116047

Ubuntu 26.04 LTS – OpenSSH login denied due to strict AllowUsers policy – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Ubuntu 26.04 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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Common Problems 115584

httpd Returns 503 Because Backend Service Is Down

🟡 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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Debian 11 — libbsd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — libbsd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2016-2090 CVE-2019-20367 Upstream summary: Off-by-one vulnerability in the fgetwln function in libbsd before 0.8.2 allows attackers to have unspecified impact via unknown vectors, which trigger a heap-based buffer […]

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How to Configure Lightweight User Environments with WPARs on IBM AIX 7.3 — step-by-step IBM AIX 7.3 tutorial on Progressive Robot

How to Configure Lightweight User Environments with WPARs on IBM AIX 7.3

Introduction IBM AIX 7.3 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 7.3 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure lightweight user environments with wpars on IBM AIX […]

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Common Problems 112557

Windows Server 2019 — NTDS service pages heavily and stalls AD replication — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 03 May 2027 Affected versions: Windows Server 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 […]

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Common Problems 111699

Windows Server 2022 — SMB Access Denied After NTLM Hardening Policy Change — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 18 May 2026 Affected versions: Windows Server 2022 📖 ~1 min read Table of contents Symptom & Impact Quick Checks Deep Diagnosis Primary Fix Verification Prevention & Hardening Symptom & Impact Users and service accounts lose access to shared folders after security baseline changes disable legacy auth […]

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How to Configure DirectAccess on Windows Server 2012 R2 — step-by-step Windows Server 2012 R2 tutorial on Progressive Robot

How to Configure DirectAccess on Windows Server 2012 R2

How to Configure DirectAccess on Windows Server 2012 R2 DirectAccess provides always-on, seamless remote access for domain-joined Windows clients without requiring user-initiated VPN connections. When a DirectAccess-configured client is outside the corporate network, it automatically establishes an encrypted tunnel to the DirectAccess server using IPv6 over HTTPS (IP-HTTPS) or other transition technologies, giving users transparent […]

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Ubuntu 20.04 — memcached — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — memcached — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6382-1 Related CVEs: CVE-2022-48571 Upstream summary: It was discovered that Memcached incorrectly handled certain multi-packet uploads in UDP. An attacker could possibly use this issue to cause a denial of […]

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