try /etc/nginx/nginx.conf as this is the first conf read by nginx
/etc/nginx/nginx.conf set to include '/etc/nginx/conf.d/*.conf' and then
'/etc/nginx/conf.d/~lxcenter.conf set to include:
include /home/nginx/conf/defaults/*.conf;
include /home/nginx/conf/domains/*.conf;
include /home/nginx/conf/webmails/*.conf;