I found that I can do the admin login on the homepage of the site, after login appears at the top of the admin panel bar, but when I try to access the panel get the error 502 Bad Gateway nginx. Appears in the url this information:
http://www.mysite.com/wp-login.php?redirect_to=https%3A%2F%2Fwww.mysite.com%2Fwp-admin%2F&reauth=1
The strange thing is that deleted the plugin through my ssh terminal and the error remains, I believe the plugin changed or rewrote some wordpress theme or file. I am waiting the answer.
Thank you