MySQL/MariaDB won’t start: crash recovery runbook Pro
When MariaDB won't start after a crash, this runbook reads the error log first, matches the common causes, walks innodb_force_recovery levels 1 to 6 safely, and rebuilds from a dump on cPanel and DirectAdmin.
September 30, 2026
Mail server IP blacklisted: delisting runbook Pro
What to do with a mail server IP blacklisted by Spamhaus, Barracuda or Microsoft: find and stop the source, clean the queue, fix rDNS, SPF, DKIM and DMARC, delist, and relay mail meanwhile.
September 30, 2026
Disk full on a production server: recovery runbook Pro
A recovery runbook for a disk full on a production server: safe space to free first, inode exhaustion, what never to delete, and how to bring MySQL, Exim and Dovecot back cleanly after ENOSPC.
September 30, 2026
WP Toolkit CVE-2026-87900: what is affected and how to patch to 6.11.3
WP Toolkit CVE-2026-87900 is a critical argument-injection flaw in WP Toolkit for cPanel 6.11.2-10794 and earlier. Which versions are affected, how to confirm the fix, and what to check afterwards.
September 30, 2026
VoIP One-Way Audio Fix: 6 Checks for NAT and RTP
A step-by-step way to find why one side of a call cannot hear the other: read the SDP, check NAT settings in PJSIP and 3CX, confirm RTP reaches the PBX, and remove SIP ALG and short UDP timeouts.
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
VPN MTU Fragmentation: Fixes for Slow VPN Throughput
Find the real path MTU with ping and tracepath, spot ICMP black holes and PMTUD failures, set the right MTU and MSS clamping on WireGuard, OpenVPN and IPsec tunnels on Linux and pfSense, and measure the throughput gain with iperf3.
September 29, 2026
Group Policy Not Applying: 12 Checks with gpresult and Events
A systematic way to find out why a GPO does not reach a Windows 11 client or Windows Server 2025 member: read gpresult, check scope and filtering, decode the Group Policy events, compare AD and SYSVOL versions and turn on gpsvc debug logging.
September 29, 2026
Imunify360 After OS Upgrade: Recovery on Ubuntu and AlmaLinux 9
Repair Imunify360 after a do-release-upgrade, Debian major upgrade or ELevate run leaves the agent failing to start, using the deploy script's post-os-upgrade mode, repository fixes and verification of the firewall, WebShield and WAF.
September 29, 2026
Kill Unresponsive VM ESXi: 3 Methods (vim-cmd, esxcli, esxtop)
Power off a hung virtual machine on ESXi 7, 8 or 9 when vCenter cannot, escalating from vim-cmd power.off through esxcli vm process kill to killing the VMX world from esxtop, with the errors you will meet along the way.
September 29, 2026
Windows Update Error 0x800f0922, 0x80070002, 0x80073712: Fixes
Work through the three most common Windows Update failure codes on Windows 10/11 and Windows Server, from resetting the SoftwareDistribution folder to freeing the EFI partition and repairing the component store.
September 29, 2026
WordPress cURL Error 28: Failed to Connect Fixed (Imunify360 and CSF)
Diagnose the WordPress cURL error 28 loopback and outbound failure on cPanel servers, identify whether Imunify360, CSF, /etc/hosts or the resolver is blocking the connection, and apply the whitelist or rule fix with verification.
September 29, 2026