Help With Redirects From Storefront To Storefront


I am trying to redirect certain product pages to an addon domain based in the same installation directory as follows:

Redirect 301

Which seems to do nothing but if I remove the first part of the first URL as it is now:

Redirect 301 /hikvision-advanced-5-8-cam-turbo-hd-cctv-kit-builder-hd-tvi-2-megapixel.html

We get ‘This page isn’t redirecting properly’

What is the solution pls?