Looking for logging into the Drupal 7 502 Bad Gateway site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Drupal 7 502 Bad Gateway site. After that you can login as usual with your login credentials.
https://www.drupal.org/forum/support/post-installation/2016-10-04/502-bad-gateway-anywthing-to-do-with-drupal
https://stackoverflow.com/questions/1514576/drupal-nginx-php-cgi-502-bad-gateway-error
https://www.drupal.org/project/hybridauth/issues/1816262
https://www.drupal.org/project/mailmime/issues/2933729
https://www.drupal.org/project/barracuda/issues/1643600
https://github.com/omega8cc/boa/issues/1113
https://drupal.stackexchange.com/questions/177792/wordpress-migrate-502-bad-gateway-nginx
https://drupal.stackexchange.com/questions/163882/rewrite-with-nginx-conf-result-502-bad-gateway
https://learn.omega8.cc/how-to-debug-502-bad-gateway-error-302
https://airbrake.io/blog/http-errors/502-bad-gateway-error
https://community.spotify.com/t5/Accounts/502-Bad-Gateway-1-844-239-9888-503-Service-Unavailable-502-Bad/td-p/2983860
https://pantheon.io/docs/errors-and-server-responses/
https://serverfault.com/questions/810149/what-is-causing-this-error-on-nginx-server-502-bad-gateway