Gateway timeout

there is nothing in logs. I turned on debug to see more.

I see nothing obvious in logs

POST /wp-admin/admin-ajax.php HTTP/1.1" 200 58 "http://blog.kamva.ir/wp-admin/options-general.php?page=swpsmtp_settings" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36
2018/05/14 07:30:15 [error] 137#0: *11 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 100.100.50.1, server: localhost, request: "POST /wp-admin/options-general.php?page=swpsmtp_settings HTTP/1.1", upstream: "fastcgi://unix:/tmp/heroku.fcgi.8080.sock", host: "blog.kamva.ir", referrer: "http://blog.kamva.ir/wp-admin/options-general.php?page=swpsmtp_settings"
100.100.50.1 - - [14/May/2018:07:30:15 +0000] "POST /wp-admin/options-general.php?page=swpsmtp_settings HTTP/1.1" 504 578 "http://blog.kamva.ir/wp-admin/options-general.php?page=swpsmtp_settings" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36
100.100.50.1 - - [14/May/2018:07:30:17 +0000] "GET /favicon.ico HTTP/1.1" 200 5 "http://blog.kamva.ir/wp-admin/options-general.php?page=swpsmtp_settings" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

I have checked my username password. there is no % in them. I use no TLS and the port is 25

however, my username has / in it. there is nothing I can do about that. I just tested the SMTP server inside a test PHP application I wrote and it works.

CLIENT -> SERVER: EHLO localhost
CLIENT -> SERVER: AUTH CRAM-MD5
CLIENT -> SERVER: a2FtdmEvaGV0em5lci0wMSA0Zjg4NzA4NjZiNjMwM2NhYWNmOGZmOWRkN2Y2OWFmYw==
SMTP ERROR: Username command failed: 535 Denied
SMTP Error: Could not authenticate.CLIENT -> SERVER: QUIT
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

• This reply was modified 7 years ago by Hadi.