Firewall

pr cp 117002 r2

Ubuntu 22.04 SSH connection refused

🟑 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 πŸ“– ~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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pr cp 119535 r2

Debian 13 UFW Conflicts With nftables Policy

🟑 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 13 πŸ“– ~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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pr cp 116508 r2

Ubuntu 24.04 LTS UFW Rules Accidentally Block SSH Access

πŸ”΄ Critical   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Ubuntu 24.04 LTS πŸ“– ~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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pr cp 115480 r2

Network Service Misconfiguration Breaks Static IP

🟑 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 πŸ“– ~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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pr cp 114486 r2

NetworkManager Connection Drops on RHEL 9

🟑 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 πŸ“– ~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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pr cp 117984 r2

Ubuntu 18.04 printer not detected on USB or network

🟑 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 πŸ“– ~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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pr cp 127072 r2

CentOS Stream 10 – Common Problem 136 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: CentOS Stream 10 πŸ“– ~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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pr cp 119525 r2

Debian 13 nftables Rules Not Loaded at Boot

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 13 πŸ“– ~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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pr cp 127570 r2

CentOS Stream 9 – Common Problem 136 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: CentOS Stream 9 πŸ“– ~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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pr cp 127062 r2

CentOS Stream 10 – Common Problem 135 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: CentOS Stream 10 πŸ“– ~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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