Hello
Sounds very strange, so let back to basic
When you try and access the site what happens ?
What happens when you cannot access the site and you ping the site, type ping sussexsecuritysystems.co.uk in command prompt ?
Have you looked at the firewall logs on the server to check if your external IP address is being blacklisted ? You can find your external IPaddress by typing "WhatsMyIP" into google.
Regards Mike
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