Transferring Magento website, admin panel URL gives 404

Question

I'm having a problem which I've never experienced before when moving a Magento website to a new server.

The transfer was complete and the website is working fine, the only problem is that the admin URL gives a 404 page.

The URL for the admin panel was suppose to be:

http://mysite.com/admin

I've also tried:

http://mysite.com/index.php/admin

However the 404 is still there.

I've had a look at the local.xml and the tag is set to 'admin'.

var session/cache was all deleted. The rest of the site seems to work fine apart from this 404 error.

Any help is much appreciated.

Thanks.