February 2020 - Page 40 of 64

How to Configure Edge Transport Server for Email on Windows Server 2019 — step-by-step Windows Server 2019 tutorial on Progressive Robot

How to Configure Edge Transport Server for Email on Windows Server 2019

Overview of Edge Transport Server for Email An Edge Transport server sits in the DMZ between the internet and your internal Exchange organization. It handles inbound and outbound SMTP, anti-spam filtering, antivirus scanning, address rewriting, and connector configuration without being a domain member, thereby limiting what an attacker gains if the edge server is compromised. […]

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Oracle Linux 8 — perl-File-Find-Rule — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — perl-File-Find-Rule — vulnerability — patch and remediation guide (ELSA-2025-9605)

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2025-9605 Related CVEs: CVE-2011-10007 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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A Deep Dive into Iptables and Netfilter Architecture — step-by-step Security tutorial on Progressive Robot

A Deep Dive into Iptables and Netfilter Architecture

Firewalls are an important tool that can be configured to protect your servers and infrastructure. In the Linux ecosystem, iptables is a widely used firewall tool that interfaces with the kernel’s netfilter packet filtering framework. For users and administrators who…

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How to Set Up a VPN Server with StrongSwan IPsec on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Set Up a VPN Server with StrongSwan IPsec on RHEL 7

How to Set Up a VPN Server with StrongSwan IPsec on RHEL 7 A Virtual Private Network (VPN) allows remote users and branch offices to securely connect to your corporate network over the public internet. StrongSwan is a robust, open-source IPsec-based VPN solution that supports IKEv2, the modern and recommended key-exchange protocol for road-warrior configurations. […]

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Alpine Linux edge — gvfs — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — gvfs — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 1.40.2-r0 📖 ~4 min read  •  Source: Alpine secdb entry — gvfs 1.40.2-r0 Related CVEs: CVE-2019-12795 CVE-2019-12449 CVE-2019-12447 CVE-2019-12448 Upstream summary: Alpine community repository for vedge ships gvfs 1.40.2-r0 which addresses CVE-2019-12795. Table of contents Symptom […]

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Common Problems 121114

Debian 10: kubelet not starting due to cgroup driver mismatch

🟠 High   ⏱ 5–30 min  Last verified: 20 May 2026 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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Gentoo Linux — dev-java/velocity — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — dev-java/velocity — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202107-52 Related CVEs: CVE-2020-13936 CVE-2020-13959 Upstream summary: Multiple vulnerabilities have been discovered in Apache Velocity. Please review the CVE identifiers referenced below for details. Table of contents Symptom & Impact Environment & […]

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FreeBSD 12 — postfix-current — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 12

FreeBSD 12 — postfix-current — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: Postfix — memory corruption vulnerability Related CVEs: CVE-2011-0411 CVE-2011-1720 Upstream summary: The Postfix SMTP server has a memory corruption error, when the Cyrus SASL library is used with authentication mechanisms […]

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