Deal with DHCP Server IP Exhausted

Recently, I have a problem with DHCP Server service run on Windows Server 2003 that use full ip address ranges, alot of IP used by strange mac address (3139…, longer than 12 charater) with type DHCP/BOOTP, even my DHCP server have mac address filter add-in and assign IP option is DHCP only. No special info in event log, Google return no clear root cause and solution.

Workaround to avoid message "Chrome didn’t shut down correctly" on Ubuntu / Linux

When shutdown or reboot computer on Linux system (Ubuntu, Ubuntu Gnome etc…) I ussuallty got message "Chrome didn’t shut down correctly" everytime open Google Chrome (v 60.0.3112.101) if before shutdown I did’n close it.

Get real client IP for Apache server behind Nginx Proxy Server

Step to configuration:

Flectra v1 screenshots

Flectra is an ERP Open Source application fork from Odoo CE v11, Flectra team has just released v1 on 2017-12-25, here are some screenshots:

Switch Input method global in Ubuntu

When using Ubuntu, switching between input method so uncomfortable. I use English as default and Unikey (fcitx-unikey) for Vietnamese. You can switch between input method by the hotkey (as my setting is Ctrl + Space), the problem is this hotkey is not working if you are not in the input area.

How to stop using TLS-SNI-01 with Certbot / Ubuntu / Nginx

Source: https://community.letsencrypt.org/t/how-to-stop-using-tls-sni-01-with-certbot/83210

Workaround for bug "Extra frozen / stuck mouse cursor after auto screen lock / sleep" on Linux

Just update my Linux kernel from version 4.15.0 to 5.3.0 on Ubuntu 18.04 LTS and facing this problem. When unlock my desktop after screen turn-off, a "ghost" cursor showing up on my desktop and stuck there.