When a WordPress site is in maintenance mode, users will by default see the following message:

temporarily unavailable due to planned maintenance.
Return in a moment.

This is the most typical situation: whenever WordPress updates, the site needs maintenance.

There are some different situations also, like during development and testing, you need to manually enable maintenance mode. To do this, perform the following steps :

1. Access your account by using SSH or cPanel.

2. Enter the location where WordPress is installed using the command line or the cPanel File Manager.

3. Now, create a file with the extension. maintenance using your chosen text editor.

Note: Ensure that the file name starts with a period (.) otherwise this procedure won’t work.

 <?php

4. The following code should be copied and pasted into the.maintenance file:

    $upgrading = time();

?>

5. Upload the.maintenance file with all of the modifications.

6. Your site’s maintenance mode is now active.
Delete the.maintenance file to return the website to its usual state.

Change the maintenance mode message in WordPress.

As we previously said, WordPress alerts you when your site is in maintenance mode with the phrase “Briefly down for planned maintenance.”

However, you are still able to change the WordPress maintenance mode page that is visible.

To achieve this, take the following actions:

1. Locate the wp-content subfolder in the location where you installed WordPress using SSH or the cPanel File Manager.

2. Create a file called maintenance.php in a text editor.

3. Add the HTML or PHP code you want to use when WordPress is in maintenance mode to this maintenance.php file.
Following that, WordPress will display the maintenance.php file as opposed to the default message.

This issue occurs when user is unable to install any Plugin to manage its WordPress website. Let us go through the detailed procedure to fix the issue.

Login to cPanel account associated with your WordPress website.>>Go inside File Manager>> Now, get into WordPress domain directory and find wp-config.php file>>Right click over the file and click over Edit.>>
You will be directed to the editor page. Scroll down to last or find the below given lines.

define('DISALLOW_FILE_EDIT', true);
define('DISALLOW_FILE_MODS', true);


Modify the code from true to false. 
define('DISALLOW_FILE_EDIT', true);
define('DISALLOW_FILE_MODS', false);

Click over Save Changes

There are a number of WordPress plugins that might make the procedure easier for you if you find manually installing WordPress languages uninteresting.
The WordPress Language plugin is the most widely used.

You can switch between languages quickly and easily thanks to this plugin, which will automatically download and install the proper language files.

To set up and configure the WordPress Language plugin, follow these instructions:

(i) Log in to a WordPress site as the administrator.

(ii) On the left-hand side of the screen, choose Plugins.

(iii) Select Add New.

(iv) Type “WordPress language” into the search box, then click “Search Plugins.”

(v) Click on Install Now under WordPress Language in the Name column.

(vi) Click Activate Plugin after WordPress has finished installing the plugin.

(vii) After the plugin gets activated, a language section menu appears in the top menu bar of the administration interface :

(viii) To switch the WordPress language, first choose the language you wish to use. Then click Switch language.
If the language you wish to see is not available, select the More languages button to explore other language possibilities.

(iv) The new language preference will take effect right away.

There are occasions when it is crucial to grant access to a file or directory without a subdomain.
For instance, when you upload a file or folder to your public HTML directory, WordPress cannot reach the file location and displays a 404 error.
In these circumstances, you may cause your WordPress website to disregard the file path of that file by adding a rewrite condition to your .htaccess file.
With this, a file, such as domain.com/file.html, will be shown directly on the browser rather than being incorporated within the parent WordPress website.

How to Make WordPress Disregard a File Path

1. Navigate to your WordPress directory after logging into your account using SSH or the cPanel File Editor.
2. Use the .htaccess file to access your website.
3. Look at the sample WordPress .htaccess file below:
   

Replace the file with the file path to your saved files and add the following code above the RewriteCond lines:
RewriteCond $1 !^(/file)
4. Save your changes after that.

If your WordPress website’s permalinks are incorrect, your web pages will display the error message “404 page not found.”
You can reset the permalinks in WordPress by following the instructions below:

Making a backup of your website is the first thing you should do when troubleshooting it so that it can be restored if something goes wrong.

• Log in to your WordPress account.
• Select Permalinks under Settings.
• Change the word “Plain” in the permalink structure.
• Select “Save Changes.”

The permalinks that you chose should now appear in the URL of your website’s pages.