This could be a software problem -- you should reflect on any recent changes you or your team may have made, and contact your webmaster. Sending your webmaster a screenshot, the link of the page you are having problems with, and any error messages you see will help them figure out what might be the cause of the problem. You might also copy the error messages into a search engine to see if there are any easy fixes.

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• Backups - In addition to the services and suggestions below, it’s always a good idea to make sure you have backups (that you store somewhere other than the same place your website is!). Many hosts and website platforms have this included, but it’s best to also have additional, offline copies.

• Keep software up to date - If you are using a Content Management System (CMS) such as WordPress or Drupal, make sure that your website technology is updated to the latest software, especially if there have been security updates.

• Monitoring - There are many services that can constantly check on your site and email or text you if it goes down. This Mashable article lists 10 popular ones. Be aware that the email or phone number you use for monitoring will be clearly associated with managing the website.

• My Website is Down
• Keeping your site alive
• Security in a Box
• Threat modeling, Surveillance Self Defense Guide
• DDoS proactive and reactive measures