SSL Key Ownership
Issue: After receiving renewal notice from Let's Encrypt for Jupyter server, go to the virtual machine hosting Jupyter and renew the key successfully. But cannot login to the jupyter notebook…
CSS List item style a) b)
Issue Default ordered list item style is decimal number, lower/upper alpha, lower/upper roman then followed by a dot. Thought it's easy to change the dot to something like a)…
MathJax Load Failed – WP Security Plugin
Issue After installing a WordPress security plugin call All-In-One WP Security, MathJax failed to load some JS including. Solution In the setting of the plugin, choose the tab Additional Firewall…
CentOS VM Client Can’t Boot Up
Issue VirtualBox client CentOS can't boot up with error message: [FAILED] Failed to start Virtual Machine and Container Registration Service. [FAILED] Failed to start Login Service. Solution Disable SELINUX config…
Jupyter Notebook on Boot Automatically
Issue After making the file to create a system service for jupyter notebook running on CentOS so as to start jupyter server automatically during system start up, the service successfully…
PHP 7
PHP 7 & Related Issues
Background After installing a WordPress plugin - WP Health, it's reminded that PHP5 had no longer been supported since late 2018, thus there may be risk in all WordPress websites.…
Centos7 Virtualmin Upgrade PHP7 MariaDB
This is my first blog after upgrading to WordPress 5.1 from ver.4.8. Yes, I never tried 5.0 as it's always risky to have a major upgrade to ver. x.0. The…
Cannot launch or remove iTunes from Mac High Sierra
Issue: when launching iTunes, it closed immediately after clicking the icon and appeared in half a second, then error screen appeared to ask for "ignore", "report", etc. Solution: Finder ->…
Mail Server Already Exists error iPhone iOS 11
Issue: When open an email box, error appeared on iPhone warning: Cannot verify Mail Server Identity. One solution for this problem is to delete that mail account on iPhone and…
WordPress Duplicator Plugin Server Error 500
Issue: During scanning stage of running the Duplicator plugin on a WordPress site, there was an error: Server Error 500. Solution: Modify /etc/php.ini file to increase memory: memory_limit = 256M…