Well, now I get this error in my browser :

The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at admin@example.com to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Apache/2.4.9 (Win64) PHP/5.5.12 Server at cbsl.ddns.net Port 80

Hmmm, ok try this...

RewriteEngine on
RewriteCond %{HTTP_HOST} ^cbsl.ddns\.net$
RewriteRule (.*) http://cbsl.ddns.net/$1 [R=301,L]
RewriteRule ^$ cbsl [L]

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Or maybe this would be better:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^ddns\.net$
RewriteRule (.*) http://cbsl.ddns.net/$1 [R=301,L]
RewriteRule ^$ cbsl [L]

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I made an error earlier, this is the correct way to do this:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^cbsl\.ddns\.net$
RewriteRule (.*) http://cbsl.ddns.net/$1 [R=301,L]
RewriteRule ^$ cbsl [L]

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I copy/pasted your last proposal, same error

Idea ...
I was thinking about changing the current index.php which is located in the www directory to "call" from there the index.php located in www\cbsl (and rename the actual index.php)

Maybe I was jumping the gun a little, did you enable mod_rewrite and .htaccess through httpd.conf and then put the code in your root/.htaccess because that could be the reason it's not working.

I don't think changing index.php is the good way to go, the ,htaccess way should be working...

Indeed not
I am a real beginner with Apache
Can you tell me exactly where I have (and what) to change in the httpd.conf ?
Thanks

Also found this might be helpful

Many thanks now it works perfectly !

Sweet!! Sorry I was jumping the gun ... Assuming and such ;-)

I have a second question : later on, i will move "my" site from my local PC to another site (hosted by OVH company).
What will I have to change on my site (during a certain period after which I will suppress my site definitively), on Apache to redirect to that other site instead of mine
To be practical, to site says "cbsl.be"

Hi,

I'd like to answer your question, but best way to do this is to start a new one (if you didn't already)... It's not for the points, don't care about that, but it's EE's policy.

Thanks.

Ok, will do that