Please whitelist the following IP addresses:

  • 52.7.54.48
  • 138.197.110.173
  • 45.55.63.67

You could trying the following commands on your server to whitelist SimpleBackups by adding it's IP addresses to the firewall.

sudo ufw allow from 52.7.54.48 to any port 22

sudo ufw allow from 138.197.110.173 to any port 22

sudo ufw allow from 45.55.63.67 to any port 22

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