DNS

Common Problems 115443

RHEL 7 – Legacy service Command Reports Running but Port Is Closed

🟡 Medium   ⏱ 5–30 min  Last verified: 29 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 Configure Mandatory Access Control with SELinux Policies on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure Mandatory Access Control with SELinux Policies on RHEL 7

How to Configure Mandatory Access Control with SELinux Policies on RHEL 7 SELinux (Security-Enhanced Linux) is a mandatory access control (MAC) framework built into the Linux kernel and deeply integrated into RHEL 7. Unlike discretionary access control (DAC), which is based on user and group ownership, SELinux enforces fine-grained access rules based on security contexts […]

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Common Problems 112512

Windows Server 2019 – SChannel TLS handshake failures after cipher hardening – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 December 2019 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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How to Set Up Remote Desktop Services Collections on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up Remote Desktop Services Collections on Windows Server 2019

How to Set Up Remote Desktop Services Collections on Windows Server 2019 Remote Desktop Services Collections are logical groupings of RD Session Host servers in Windows Server 2019 that publish a common set of resources — either full session desktops or RemoteApp programs — to a defined group of users. Collections are managed centrally through […]

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How to Set Up DNSSEC on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up DNSSEC on Windows Server 2019

Introduction to DNSSEC on Windows Server 2019 DNSSEC (Domain Name System Security Extensions) adds cryptographic signatures to DNS records, allowing resolvers to verify that responses are authentic and have not been tampered with in transit. Without DNSSEC, a resolver has no way to distinguish a legitimate DNS response from a forged one injected by a […]

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How to Set Up Windows Server 2019 as a RADIUS Proxy — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Set Up Windows Server 2019 as a RADIUS Proxy

Introduction to RADIUS Proxy A RADIUS proxy receives authentication requests from RADIUS clients (VPN servers, wireless APs, switches) and forwards them to remote RADIUS servers based on configurable rules. Windows Server 2019 with the Network Policy Server (NPS) role can function as a RADIUS proxy in addition to—or instead of—acting as a full RADIUS server. […]

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Common Problems 120980

Repository URLs Return 404 During apt update

🟡 Medium   ⏱ 5–30 min  Last verified: 27 December 2019 Affected versions: Debian 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 & […]

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Common Problems 113034

Windows Server 2016 — krbtgt password reset procedure required after suspected golden ticket exposure — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 27 December 2019 Affected versions: Windows Server 2016 📖 ~2 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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SLES 15 — jackson-databind — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — jackson-databind — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 27 December 2019 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE security advisory Related CVEs: CVE-2018-11307 CVE-2018-14718 CVE-2018-14721 CVE-2018-19360 CVE-2018-19361 CVE-2018-19362 CVE-2018-7489 CVE-2019-14379  +12 more Upstream summary: An issue was discovered in FasterXML jackson-databind 2.0.0 through 2.9.5. Use of Jackson default typing along with […]

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How to Configure Kubernetes RBAC on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Configure Kubernetes RBAC on RHEL 8

Role-Based Access Control (RBAC) is the primary authorization mechanism in Kubernetes, allowing you to define exactly which users and service accounts can perform which actions on which resources. On RHEL 8 clusters this is especially important when multiple teams share the same cluster or when you need to grant applications only the permissions they need […]

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