Oh, code is displayed in wrong way. I'll try to insert it again:
location / {
try_files $uri $uri/ /index.php?$args;
}
location ~ [^/]\.ph(p\d*|tml)$ {
try_files /does_not_exists @php;
}
location @php {
fastcgi_index index.php;
fastcgi_param PHP_ADMIN_VALUE "sendmail_path = /usr/sbin/sendmail -t -i -f info@mysite.ru";
fastcgi_pass unix:/var/www/php-fpm/myuser.sock;
fastcgi_split_path_info ^((?U).+\.ph(?\d*|tml))(/?.+)$;
try_files $uri =404;
include fastcgi_params;
}

hello

this must be an error on the redirection set on the server.. this should work normally on any Joomla installation... your other forms work ok?

Yes, all other components (kunena forum, akeeba subscriptions, acy mailing, one click registration) work without errors. Your extension also worked fine on local server and on hosting with apache +nginx. Backend forms is ok on this server, but on frontend I see only first 2 pages. And no strings are inserted into database after submitting. I saw the same problem here: http://www.joomlathat.com/support/affiliate-tracker/after-submitting-the-registration-form-i-get-404-not-found . How did you resolve it?

I found how to resolve the problem. In the site\components\com_affiliatetracker\views\account\tmpl\form.php I saw that form action called index.php, that phisically don't exist. So restriction of the server don't allow to call not existing file. When I changed the string 22 :

to
"
the submit button began to work. I created an account and see it in frontend and backend.
May be, you can give more right string for form action? Correct me, please, if I am wrong.

hello,
if this helps, great, go ahead. but again, this is somehow related to your server routing configuration.. in a "normal" joomla installation, this "index.php" will be correctly routed to the route of the site.

good work, anyway!