DNS

Common Problems 113891

RHEL 10 – dnf upgrade fails with modular dependency conflicts – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 December 2025 Affected versions: RHEL 10 📖 ~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 & […]

Read more
Common Problems 114113

SSSD offline authentication intermittently fails

🟠 High   ⏱ 5–30 min  Last verified: 27 December 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary Domain users cannot log in during directory service outages. Symptoms pam_sss errors […]

Read more
Common Problems 113968

RHEL 10 SSH Public Key Authentication Suddenly Stops Working

🟠 High   ⏱ 5–30 min  Last verified: 26 December 2025 Affected versions: RHEL 10 📖 ~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 & […]

Read more
Common Problems 114015

RHEL 10 – firewalld zone assignment resets when interface name changes

🟡 Medium   ⏱ 5–30 min  Last verified: 25 December 2025 Affected versions: RHEL 10 RHEL 10.0 RHEL 10.1 📖 ~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 & […]

Read more
Common Problems 114123

dnsmasq conflicts with system resolver on port 53

🟡 Medium   ⏱ 5–30 min  Last verified: 24 December 2025 Affected versions: RHEL 10.0 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary Local DNS service fails to bind because port 53 is already in use. Symptoms […]

Read more
Common Problems 114052

NFS mount delays boot with long timeout

🟠 High   ⏱ 5–30 min  Last verified: 23 December 2025 Affected versions: RHEL 10.0 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary System startup hangs waiting for unreachable NFS mount targets. Symptoms Boot reaches emergency or […]

Read more
SLES 16 — unbound — multiple vulnerabilities (16 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — unbound — multiple vulnerabilities (16 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 22 December 2025 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2019-16866 CVE-2019-18934 CVE-2020-12662 CVE-2020-12663 CVE-2022-3204 CVE-2025-5994 CVE-2025-11411 CVE-2014-8602  +8 more Upstream summary: Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a […]

Read more
Common Problems 113991

RHEL 10 – boot drops to emergency mode from stale fstab UUID entry – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 21 December 2025 Affected versions: RHEL 10 📖 ~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 & […]

Read more
Common Problems 114071

RHEL 10 – dnf lock contention from background PackageKit process – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 21 December 2025 Affected versions: RHEL 10 📖 ~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 & […]

Read more
Common Problems 113970

RHEL 10 – nftables backend conflicts with legacy iptables tooling – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 19 December 2025 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 […]

Read more
CHAT