You have administrator rights to my page
I have the same problem.
When I try to connect to the store, the link (http://artgate.com.pl/wp-admin/admin-post.php?action=ec_connect) redirects me to (http://artgate.com.pl/wp-admin/ admin-post.php? action = ec_connect) an error is displayed on the page 404.
At the same time, it blocks my access to the WP ERR_TOO_MANY_REDIRECTS administration panel until cookies are removed.
My ID ecwid.com/store/30085071
