Somesh79

No, only needed when you changed the defaults. I did not understand that what is meant by these lines as I can remote log into the server (via my url not ip) to do all these things.
Check your virtual host too and document root path etc.What is in the error log and what you are see in browser after debug set to true?

you can check the ownership for the wp folders , it should be user as owner and apache as group also check the permission for the folders and set the right permissions.
You can also set debug mode true in wp-config.php to see the error at browser and also check the error logs.This will give you some right direction.

I think you should check at your domain control panel provider by your service provider and then points the name servers in DNS settings to IP of the web server where website hosted.

If you still have problem then let me know

Have a look at https://www.wpbeginner.com/beginners-guide/step-by-step-guide-to-install-a-wordpress-plugin-for-beginners/

Hope your problem resolved

You can add or update any plugin in local environment and then upload it at server.You can move your desired plugin to the plugin folder in wp-content folder with ssh.Unzip it and then in browser you will see that plugin then just activate it and all done.Also check the owner and group of the wp folder.

Have a look at https://o6asan.com/blog-e/2014/06/22/the-solution-of-ssl3_read_bytessslv3-alert-handshake-failure-on-wordpress/

Just replace

$xml = simplexml_import_dom( $dom );

with

$xml = simplexml_load_file($file);

can you access the mysql for the user described in wp-config.php, and what is the permissions for wp-content folder

set the permissions as chmod -R 775 for wp folder and check that what is the group set for wp folder , it should be access by apache server.

Give a try by define(‘WP_DEBUG’, true); in wp-config.php and then you will find the right cause of the problem in the browser.