Developer and IT

How to run a virtual machine on Windows 11 with Hyper-V, VirtualBox or VMware Workstation Pro: requirements, setup steps, TPM for Windows 11 guests and fixes.

504 Gateway Timeout means a proxy or gateway got no reply from the server behind it in time. What it means, visitor fixes, and nginx, Cloudflare and cloud fixes.

NET::ERR_CERT_AUTHORITY_INVALID means the browser does not trust the site’s certificate issuer. Fixes for visitors, IT teams and website owners in Chrome and Edge.

Install Windows 95 on VirtualBox from your own licensed media: VM settings, FDISK and FORMAT, running Setup, protection error fixes and display limits.

Fix ERR_CONNECTION_TIMED_OUT on Windows 11 and 10: reset TCP/IP with netsh, flush DNS, clear the proxy and hosts file, update the adapter driver, restart the router.

A 404 error means the server cannot find the page at that URL. Recover as a visitor, check the status with DevTools or curl, and fix 404s on your own site.

Manage Apple devices with Microsoft Intune: set up the MDM push certificate, ADE token, enrollment, compliance, apps, updates and fixes for iPhone, iPad and Mac.

Chmod 777 gives the owner, group and every other user read, write and execute rights. Learn how to use it, why it is risky, and the safer modes to pick instead.

Error 502 means a gateway or proxy got an invalid reply from the server behind it. The nine common causes, visitor fixes, and how site owners diagnose a 502.

Enable the new Software Center in SCCM ConfigMgr from Client Settings > Computer Agent, pilot it on one collection, verify it, and fix missing apps and tabs.

Check if Hyper-V is enabled on Windows 11 in Windows Features, PowerShell, DISM or System Information, and what to do when Hyper-V is missing or not running.

Refresh Microsoft Edge with F5 or Ctrl+R, and hard refresh with Ctrl+Shift+R or Shift+F5 on Windows 11/10. DevTools reload, cache clearing and fixes.