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SwiftTransport Exception : Expected response code 220 but got code "421"

I am using FOSUserBundle with Symfony2 , a few days ago the sign up processes works fine, then suddenly I get the folowing error when signing up : 

Expected response code 220 but got code "421", with message "421 Cannot connect to SMTP server x.x.x.x (x.x.x.x), connect error 10061
 500 Internal Server Error - Swift_TransportException
"

with : 

x.x.x.x stands for smtp IP adress

It's related to smtp. Any idea how to solve this problem ?

Solution

  • as @cheesemacfly said it was a problem of my smtp server. it was down.

    I waited for a while reattempted an it worked fine.