Net::OpenTimeout (execution expired) exception with Rails mailer

问题:

I have problem with delivering emails on production server. When mailer processed new message, calls exception Net::OpenTimeout (execution expired)

My smtp settings:

#settings.yml production:   smtp:     address:        smtp.gmail.com     port:           587     domain:         mydomain.net     user_name:      username@gmail.com     password:       password     authentication: plain     enable_starttls_auto: true 

My environment settings:

  #production.rb   config.action_mailer.delivery_method = :smtp   config.action_mailer.smtp_settings = Settings.smtp.symbolize_keys 

From logs:

Sent mail to username@gmail.com (30010.1ms) I, [2014-10-15T12:59:22.371563 #19779]  INFO -- : Completed 500 Internal Server Error in 30051ms F, [2014-10-15T12:59:22.373984 #19779] FATAL -- :. Net::OpenTimeout (execution expired): app/controllers/subscribers_controller.rb:9:in `create' 

回答1:

My VPS provider (DigitalOcean) blocked SMTP on IPv6 by default :(

I had to disable IPv6 on server with next config:

# /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1  net.ipv6.conf.default.disable_ipv6 = 1  net.ipv6.conf.lo.disable_ipv6 = 1  

Apply settings:

$ sysctl -p 

Uncomment the next line in /etc/gai.conf to prefer IPv4:

precedence ::ffff:0:0/96 100 

And remove IPv6 DNS from /etc/resolv.conf:

nameserver 2001:4860:4860::8844 # remove lines like this  nameserver 8.8.8.8 #don't remove 

Then restart application and Nginx (optional)

回答2:

I had the same issue, in my case it was because Google Cloud Compute platform blocks outgoing connections to SMTP servers outside of Google's domain on ports 25, 465, and 587.

To fix this problem we had to connect to a non-standard SMTP port (most API-based mailer platforms support 2525 as well for this reason).

文章来源: Net::OpenTimeout (execution expired) exception with Rails mailer