CentOS/RHEL 6 EOL: Switch to the Vault & Fix yum TLS/Cert Problems CentOS/RHEL 6 mirrors are gone. To keep legacy hosts updating, point yum to the CentOS Vault and refresh certificates. Below is a minimal, repeatable setup. 1) Disable the old mirrorlist repos sed -ri 's/^enabled=1/enabled=0/' /etc/yum.repos.d/CentOS-Base.repo || true 2) Create a lean Vault repo file Enable only the 6.10 vault repos (fast/stable) and set metadata to never expire: cat >/etc/yum.repos.d/CentOS-Vault.repo <<'EOF' [C6.10-base] name=CentOS-6.10 - Base baseurl=http://vault.epel.cloud/6.10/os/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 enabled=1 metadata_expire=never [C6.10-updates] name=CentOS-6.10 - Updates baseurl=http://vault.epel.cloud/6.10/updates/$basearch/ gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6 enabled=1 metadata_expire=never [C6.10-extras] name=CentOS-6.10 - Extras baseurl=http://vault.epel.cloud/6.10/ext...

Headless NVIDIA + VirtualGL + TurboVNC on CentOS/RHEL 6 (EOL): A Working Guide Why this post? CentOS/RHEL 6 are end-of-life, so current docs often break. This guide shows a known-working setup for running OpenGL apps over the network with VirtualGL 2.6.x and TurboVNC 2.2.x on headless NVIDIA GPUs (Tesla-era), including the critical NV-GLX / GLXCreateContext fixes. Versions that still work on CentOS 6 VirtualGL: 2.6.x (e.g., 2.6.5-20201117 ) — 3.x requires newer glibc. TurboVNC: 2.2.x (e.g., 2.2.90-20211222 ) — 3.x requires newer glibc and libXfont2. NVIDIA driver: 390.xx is a practical ceiling for many Fermi/Tesla cards. Enable the VirtualGL & TurboVNC repos Create two repo files (adjust baseurls if yours differ): [root@host ~]# cat >/etc/yum.repos.d/VirtualGL.repo <<'EOF' [VirtualGL] name=VirtualGL baseurl=https://virtualgl.org/pmwiki/uploads/Downloads/CentOS/6/x86_64 enabled=1 gpgcheck=0 EOF [root@host ~]# cat >/etc/yum....

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Figure 1: Modern antivirus protection concept for 2025. Best Free Antivirus for Home Use (2025 Edition) 🕒 Updated October 2025 — Sophos Home Free is no longer available to new users, but there are still great free antivirus options. If you’re looking for a trusted, no-cost antivirus solution for your home PC or Mac, here’s the 2025 reality: most vendors now offer free trials instead of fully free versions. However, a few excellent choices remain that deliver real-time protection without requiring a paid subscription. ⚙️ Top Recommended Free Antivirus Tools (2025) Microsoft Defender (Windows 10/11) — Built into Windows and now one of the best free antivirus options available. It includes real-time protection, ransomware defense, and smart cloud-based threat detection. No registration or ads. Avast One Essentials — Free tier with core antivirus, Wi-Fi inspector, and password protection. Lightweight and easy to use. Bitdefender Antivirus Free — Si...

Guide • 2025 Edition 🔥 Top 10 Free AI Tools That Will Save You Hours Every Week (2025 Edition) Keywords: free AI tools, best AI tools 2025, AI productivity apps, AI for students, AI for creators, AI for work TL;DR: These 10 free AI tools handle writing, summaries, emails, images, meetings, notes, audio, automation, and browsing—saving you hours every week with zero coding. Quick Navigation Introduction AI Writing Assistants Summarizing & Reading Faster Emails & Communication AI Image Tools Meeting Helpers Organization & Notes Music & Audio Daily Automation Browser Extensions Bonus: Combine Them FAQ 🧭 Introduction: From Hype to Everyday Help Artificial Intelligence isn’t just for techies anymore. What started as futuristic hype has become the ultimate time-saver for everyday life. Whether you’re a student buried in ...

Figure 0: Cybersecurity protection for small businesses in 2025. What Every Small Business Should Know About Cybersecurity in 2025 Keywords: small business cybersecurity 2025, cyber insurance, ransomware, phishing, MFA, backups, zero trust TL;DR: Focus on people, passwords (passkeys/MFA), patching, backups, and a simple incident plan. Start small, automate, and improve monthly. Quick Navigation Introduction 2025 Threat Landscape (Plain English) 10 Security Essentials for Small Businesses People & Training (Human Firewall) Backups & Ransomware Readiness (3-2-1) Vendors, Cloud, & Email Security Cyber Insurance: What Underwriters Expect Simple Incident Response Playbook Budget Tiers & 30/60/90-Day Plan FAQ Introduction: Security That Fits Your Size You don’t need a Fo...

Do the domain that was created by default is not the domain that you intended.  Or when you setup zimbra you were not paying attention and server name got added in front of the domain ie mail.domain.com instead of just domain.com. Now you need to setup the ham, spam, galsync, and virus-quarantine accounts to your new domain. Lets start with ham and spam. From zimbra webadmin find the spam and ham accounts under manage and then search individually for ham and spam.  They will have random characters after the name.  We will need the full name of both accounts.  Right click to edit the account and under account name change the domain to your newly created domain and save.  Do this for both accounts.  Also get the names of both accounts.  You can copy and paste them to use in the following command line. As zimbra user on the mail server run these commands. You can also check the current spam accounts with zmprov gcf zimbraSpamIsSpamAccount zimb...

In an earlier post I mentioned how to tag/add EXTERNAL to the subject header on exim.  I made the changes on our Sophos UTM which may require re-applying the configuration files after Sophos UTM update. I ended up adding and elif block to act on outgoing emails in the exim.system_filter file this is the block I added.  Change your domain as appropriate and add additional lines if you need to. elif  $header_from: contains "@yourdomain.com>"  and $header_to: does not contain "@yourdomain.com>"  and $header_subject: contains "[EXTERNAL]" then  headers add "Old-Subject: $h_subject:"  headers remove "Subject"  headers add "Subject: ${sg{$h_old-subject:}{[[]EXTERNAL[]]}{}}"  headers remove "Old-Subject" endif This is the full exim.system_filter file To have the $h_from or $header_from act on the domain part and not the display name part if someone was trying to spoof the from name I added the > at the ...

for incoming email not from our domain (external domains) we want to add [EXTERNAL] to the subject but if it already contains [EXTERNAL] we do not want to add it again. I made the changes on our Sophos UTM 9 system.  More than likely it will require rewriting these files after a update.  This should apply to other systems running exim. If your exim is installed in chroot enviroment you want to place the files there on Sophos UTM this is /var/chroot-smtp/etc/ on system with non chroot it may be /etc/exim/ created a file /var/chroot-smtp/etc/exim.system_filter with following contents change domains to match your enviroment.  The > placed on the end of the match sstring so it does not match email address spoofing in display name using your domain.  /var/chroot-smtp/etc/exim.system_filter if $header_from: does not contain "@yourdomain.com>" and $header_from: does not contain "@yourdomain.localdomain>" and $header_from: does not contain ...

With the phishing attempts that consonantly target users your company can get exposed to a possible infiltration because a user thought a representative of the company sent them an email asking to change the password or to cleanup a full inbox, etc. In the email they will have a link and a login page that is used to collect the users login name and password. Many companies are starting to implement some kind of indication to the user that the email originated outside the company. Some will add a tag to the subject like [EXTERNAL] if the mail system has capabilities for using transport rules, spamassasin header, postfix header_checks. Other phishing attempts would use CEO names in the name field with a different return email address. The way users fall for this is they do not look at the originating email address. It also does not help that most mail clients will only show display name when provided instead of the email. Currently zimbra does not have a way to creat...

Virtual Reality Meets Physical Reality: Using the Oculus Quest 2 for Workouts Experience the Ultimate Workout with the Oculus Quest 2 VR Headset Are you looking for a new and exciting way to stay fit and healthy? Do you find your current workout routine dull and monotonous? Well, look no further! The Oculus Quest 2 virtual reality headset might just be the solution you need to mix things up. Whether you're a fitness enthusiast or just starting out on your fitness journey, the Quest 2 can provide you with an engaging and interactive workout experience like no other. The Oculus Quest 2 is a standalone VR headset that offers a wide range of VR games and applications to choose from. I recently got my hands on the Quest 2 and have been using it to play two of the most popular VR games for fitness enthusiasts: Beat Saber and Les Mills Body Combat. These two games offer a great workout experience that can help you reach your fitness goals in a fun and entertaining way. With the Quest 2, y...