Dev {Tricks}

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Preview Could Not Be Loaded. Internal Server Error 500. | Elementor

How to Fix the ‘Preview Could Not Be Loaded’ Error?

Probable causes:

  1. No Theme: Some of your theme files are missing.
  2. Corrupted .htaccess: ‘Your site’s .htaccess file appears to be missing.
  3. HTTP Errors: format is < error message> content depends on the code.

Solutions. Try the following:

  1. Enable Safe Mode.
    • If the error message gone, then disable safe mode.
    • Deactivate all plugins.
    • Activate plugins one by one and check.
    • Hopefully you can find the conflicted plugin!
  2. Make sure the theme files exist.
  3. Check the structure of your permalinks.
  4. Edit in incognito mode with your browser.
  5. Check PHP version of your hosting.

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The service ‘exim’ on server xxx is currently down

Rebuild your exim.

cd /usr/local/directadmin/custombuild
./build update
./build set exim yes
./build set eximconf yes
./build set eximconf_release 4.5
./build set spamassassin yes
./build update
./build exim
./build exim_conf

Start, stop and restart the Exim mail server

Start Services:

/etc/init.d/exim start

or

service exim start

Stop Services:

/etc/init.d/exim stop

or

service exim stop

Restart Services

/etc/init.d/exim restart

or

service exim restart

Status of Exim service:

/etc/init.d/exim status

or

service exim status

or

systemctl status exim.service

Edit exim conf

vi /etc/exim.conf

 

Helpfiles for Exim

https://help.directadmin.com/?topic=17

 

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Enable Shortcodes in WordPress

Add the codes in functions.php of your main or child theme.

  • Enable shortcodes in any text widget area. 
    add_filter( 'widget_text', 'shortcode_unautop');
add_filter( 'widget_text', 'do_shortcode');
  • Enable shortcodes in excerpts. 
    add_filter( 'the_excerpt', 'shortcode_unautop');
add_filter( 'the_excerpt', 'do_shortcode');
  • Enable shortcodes in description field for archive pages. 
    add_filter( 'term_description', 'shortcode_unautop');
add_filter( 'term_description', 'do_shortcode' );
  • Enable shortcodes in comments. 
    add_filter( 'comment_text', 'shortcode_unautop');
add_filter( 'comment_text', 'do_shortcode' );
  • …..

 

 

 

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Fdisk command line in Linux to help to manage partitions

fdisk command line utility is used to view and manage hard disks and partitions on Linux systems.

  • Commonly used fdisk commands. 
    n – Create partition
p – print partition table
d – delete a partition
q – exit without saving the changes
w – write the changes and exit.
  • Display disk cylinders | View all existing disk partitions | command to list the partitions | View all Disk Partitions in Linux | List Partitions 
    fdisk -l
  • View partitions of a specific hard disk (for example, vda) 
    fdisk -l /dev/vda
  • To get more information detailed and size readable by human of a specific hard disk. 
    partx -s /dev/vda
  • Delete a hard disk partition
    If you would like to combine several partitions (for example, /dev/vda2 and /dev/vda3) into a single disk partition, you have to first delete all those individual partitions, as shown below.

    fdisk /dev/vda

    Then

    Command (m for help): p

    Then

    Command (m for help): d

    Then

    Partition number (1-5): 3

    Then

    Command (m for help): d

    Then

    Partition number (1-5): 2

    Then

    Command (m for help): w
  • Create a new disk partition 
    fdisk /dev/sda
    Command (m for help): n