Step-by-step guides and fixes for server administrators: cPanel, DirectAdmin, Windows Server, email, DNS, security and more. Free to read, tested on real servers. Press / to search.
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VoIP Codec Bandwidth: G.711 vs G.729 vs Opus, Per-Call Figures
How much bandwidth each VoIP call really uses once packet headers are added, how SRTP and VPN tunnels change it, and how to size a connection for a given number of concurrent calls.
September 30, 2026
Disable SIP ALG on 9 Routers and Firewalls (One-Way Audio Fix)
What SIP ALG does, why it breaks modern VoIP, how to confirm it is rewriting your packets, and the exact commands to turn it off on MikroTik, Cisco IOS, Juniper SRX, FortiGate, SonicWall and Linux.
September 30, 2026
SIP Ports Firewall Rules: 4 Setups for CSF, firewalld and pfSense
Which ports a PBX really needs (SIP 5060/5061 and the RTP media range), how to open them in CSF, firewalld and pfSense, and how to restrict SIP to your trunk provider so scanners cannot brute-force extensions.
September 30, 2026
Warm Up New Mail Server IP Without Spam Problems
A practical warm-up plan for a new cPanel, DirectAdmin or Postfix mail server IP or a new sending domain — authentication first, a volume ramp by day, relay options, automated warm-up tools and the signals that tell you to slow down.
September 29, 2026
Best VPS for cPanel and DirectAdmin in 2026: What to Check
What actually matters when you pick a VPS for a cPanel, DirectAdmin or LiteSpeed hosting server — virtualization type, reverse DNS, outbound port 25, backups, licensing and support — and how InterServer, Vultr, DigitalOcean, Hostinger and Cloudways compare on those points.
September 29, 2026
Zoho Cliq Networks: set up external partner collaboration
Create a Zoho Cliq Network for partners, vendors and contractors, configure its branding, policies, roles and teams, invite external members with expiring links or bulk import, delegate administration, and verify that guests see only what they should.
September 29, 2026
Windows 11 Patch Tuesday September 2026 (KB5124008) and the KB5129195 out-of-band fix: what changed
What the September 2026 cumulative update KB5124008 brings to Windows 11 25H2 and 26H1, why Microsoft shipped the KB5129195 out-of-band update for Remote Desktop, and how to stage both safely.
September 29, 2026
Windows 11 Compatibility Hold: Avoid 25H2 and 26H1 Upgrade Problems
Understand why Windows Update refuses to offer Windows 11 25H2 or 26H1 to some devices, how safeguard holds work, how to identify the hold ID with Update Compliance or the registry, and when it is safe to override.
September 29, 2026
Imunify360 Whitelist IP and Countries from the CLI: Commands
Use imunify360-agent ip-list and country-list commands to whitelist and blacklist addresses, networks and countries, remove greylist blocks, create RBL exemptions, script bulk imports, and confirm the entries are active in the firewall.
September 29, 2026
Upgrade vCenter 8 to 9: Safe Migration Assistant Steps
Perform the two-stage VCSA 8.0 U3 to vCenter 9.1 upgrade using the installer ISO, from pre-checks and backups through deploying the new appliance, copying data, and validating services and plugins afterwards.
September 29, 2026
Upgrade ESXi 8 to 9.1: Safe esxcli and Lifecycle Manager Steps
Plan and execute an ESXi 8.0 U3 to 9.1 upgrade, either per host with esxcli software profile update from an offline bundle or cluster-wide with vSphere Lifecycle Manager images, with the pre-checks, VIB conflicts and rollback path.
September 29, 2026
Imunify360 Force Update and Rollback: Safe Staged Rollouts
Understand how Imunify360 staged rollouts delay new versions for up to two weeks, update manually with dnf or apt, force the latest build with the official script, test beta from the testing repository, and roll back to a previous package version safely.
September 29, 2026