Regular monitoring of your website
Ensure you have some form of security software on your website that will help you to monitor and detect any changes made to your website and potentially bad traffic, such as;
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Firewall / Web Application Firewalls - helps to protect your web applications be filtering and monitoring traffic between your website and the internet. Helps to protect your website from cross-site-scripting, and sql injection.
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File Change / Audit software - Regularly test and check your website for any abnormalities or unusual content that you or your colleagues have not placed on your website.