iirc there is something with the order/length of location $var {} - content.
is there an index.php in /home/ian/websites/reseller/htdocs?
what is the dir_permissions from /home/ian/websites/reseller/htdocs?
what are the file_permissions for /home/ian/websites/coachmaster3dev/htdocs/index.php?
what is the dir_permissions home/ian/websites/coachmaster3dev/htdocs?
403 Forbidden is a trustable output.