Hi,
DON'T delete the rewrite rule.. it is for Ceon URI Mapping.
As to your original problem, you say you've changed your site from using https://featherart.com.au to https://www.featherart.com.au... do you have SSL certificates for BOTH https://featherart.com.au and https://www.featherart.com.au?
As it is, neither address is working at the minute because of a misconfigured SSL setup.
To put your mind at rest somewhat, none of your troubles are to do with Ceon URI Mapping or its rewrite rule, your problems are caused by your server misconfiguration, not the rule in the .htaccess file, it doesn't care what domain you are using.
All the best...
Conor
ceon
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