Ruby on rails Heroku运行rake db错误

我正在尝试运行heroku run rake db:migrate，这就是我遇到的错误。为什么会出现这种错误？我以前做过很多次，从未见过这种错误

提前谢谢

Heroku client internal error.


Error:       Operation timed out - connect(2) (Errno::ETIMEDOUT)
Backtrace:   /Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:39:in `initialize'
             /Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:39:in `open'
             /Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:39:in `block in start'
             /usr/local/heroku/ruby/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
             /Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:31:in `start'
             /Users/johndoe/.heroku/client/lib/heroku/command/run.rb:113:in `rendezvous_session'
             /Users/johndoe/.heroku/client/lib/heroku/command/run.rb:100:in `run_attached'
             /Users/johndoe/.heroku/client/lib/heroku/command/run.rb:21:in `index'
             /Users/johndoe/.heroku/client/lib/heroku/command.rb:206:in `run'
             /Users/johndoe/.heroku/client/lib/heroku/cli.rb:28:in `start'
             /usr/local/heroku/bin/heroku:24:in `<main>'

Command:     heroku run rake db:migrate
Version:     heroku-toolbelt/2.35.0 (x86_64-darwin10.8.0) ruby/1.9.3

Heroku客户端内部错误。 错误：操作超时-连接（2）（错误号：：ETIMEDOUT） 回溯：/Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:39:in'initialize' /Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:39:in'open' /Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:39:in'block in start' /usr/local/heroku/ruby/lib/ruby/1.9.1/timeout.rb:68:in'timeout' /Users/johndoe/.heroku/client/lib/heroku/client/rendezvous.rb:31:in'start' /Users/johndoe/.heroku/client/lib/heroku/command/run.rb:113:在“会合会话”中 /Users/johndoe/.heroku/client/lib/heroku/command/run.rb:100:in'run\u attached' /Users/johndoe/.heroku/client/lib/heroku/command/run.rb:21:in'index' /Users/johndoe/.heroku/client/lib/heroku/command.rb:206:在'run'中 /Users/johndoe/.heroku/client/lib/heroku/cli.rb:28:in'start' /usr/local/heroku/bin/heroku:24:in`' 命令：heroku run rake db:migrate 版本：heroku toolbelt/2.35.0（x86_64-darwin10.8.0）ruby/1.9.3

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经常发生在我身上。只要再发一次命令，就行了

如您所见，错误：操作超时-连接（2）（Errno:：ETIMEDOUT）。可能是服务器关闭了。