The server requested authentication method unknown to the client

 Mysql Version : 8.0.23

PHP version : 5.6.40

CentOS Linux release 7.9.2009 (Core)

Take a backup of /etc/my.cnf

[mysqld]

default_authentication_plugin= mysql_native_password

Restart Mysql service

systemctl restart mysqld

Failed to connect to MySQL: Server sent charset unknown to the client. Please, report to the developers

 Mysql Version : 8.0.23

PHP version : 5.6.40

CentOS Linux release 7.9.2009 (Core)

Take a backup of /etc/my.cnf

[mysqld]
character-set-server=utf8

Restart Mysql service

systemctl restart mysqld

fwrite() expects parameter 1 to be resource, bool given in

Sometimes in Opencart you may get these kind of warnings in browser.

fwrite() expects parameter 1 to be resource, bool given in /var/www/html

Solution to fix:

Check your selinux status, if selinux is enabled, you need to disable selinux and reboot the machine.

How to restrict wp-admin access from one IP

 How to restrict wp-admin access from one IP

As you know, wordpress is a easy to hack content management system. If you want to restric the admin area of your wordress (wp-admin), you can easily do this by adding the below line in .htaccess

Go to the folder where your blog hosts

vi .htaccess

<IfModule mod_rewrite.c>

<Files wp-login.php>

order deny,allow

deny from all

allow from 121.15.102.0/255.255.255.0    (Add your IP or range here)

</Files>

RewriteEngine On

RewriteBase /

RewriteRule ^index\.php$ - [L]

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule . /index.php [L]

</IfModule>

Save the file and test.