Let’s Encrypt is a free (CA) Certificate Authority that has become a popular alternative for generating free SSL certificates. Let’s Encrypt allows you to create a fully functional SSL certification with chain files that is valid for 3 months (90 days). After 3 months, you can automatically renew the SSL certificate again for another 3 months,...

If you are trying to obtain an SSL certificate using Let’s Encrypt’s certbot, you may receive an unauthorized error for the www or *. version of your domain name and the verification fails repeatedly.   The command you use: sudo certbot certonly --webroot -w /var/www/example -d example.com -d www.example.com   The error: Failed authorization procedure. www.example.com...

Virtual Box does not offer a convenient way to expand a Windows or other virtual machine drive via the storage settings graphical interface.     Follow the steps below to expand your Virtual Box VM machine disk using vboxmanage Terminal commands.   Shutdown your Virtual Box VM. Open Terminal in Mac OS X. Navigate to the Virtual...

If you are running the latest version of Citrix Receiver 12.8, you may be experiencing issues with your Citrix mouse pointer suddenly disappearing while you work. The only way to recover your Citrix mouse cursor is to disconnect from your Citrix session and reconnect. However, your Citrix mouse cursor will disappear randomly again.   To fix...

If you launch a Microsoft Office application (Word, Excel, PowerPoint,) on Mac OS X, you may receive a prompt about launching a Microsoft AU Daemon for the first time.   You are opening the application “Microsoft AU Daemon” for the first time. Are you sure you want to open this application? The application is in a...