Debian 11

pr cp 120705 r2

Debian 11: OOM killer terminates Java service under memory pressure

đź”´ Critical   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120694 r2

Debian 11: High CPU load caused by runaway cron task

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120684 r2

Debian 11: Nginx serves incomplete TLS certificate chain

đźź  High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120673 r2

Debian 11: certbot renewal fails because web server port is occupied

đźź  High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120663 r2

Debian 11: rsync over SSH fails after host key rotation

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120653 r2

Debian 11: CIFS mount authentication fails with special-character credentials

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120643 r2

Debian 11: NFS mounts hang during boot

đźź  High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120633 r2

Debian 11: Fail2ban blocks internal monitoring IPs

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120623 r2

Debian 11: UFW blocks required application ports

🟡 Medium   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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 120613 r2

Debian 11: kubelet not starting due to cgroup driver mismatch

đźź  High   ⏱ 5–30 min  Last verified: 20 May 2026 Affected versions: Debian 11 đź“– ~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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Active Directory authentication authorization Backup Recovery Boot Startup Capacity Planning Cloud Integration Common Problems Containers Cpu Memory Database Debian 9 Debian 10 Debian 11 Development DNS Filesystem Firewall Fix Prevention JavaScript Kerberos Kernel Drivers Logging Monitoring Lvm Raid Networking nginx Operations Package Management Performance Proxy Python security Security Hardening Storage Disk Systemd Services time-sync Tls Ssl Troubleshooting ubuntu Ubuntu 16.04 Ubuntu 18.04 Ubuntu 20.04 Virtualization VPN web server

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