title: apn certificate expired and push notifications not working anymore
body: <p>one of my production apple push notifications expired and my push notifications service stopped working.</p>
  
  <p>I thought that I could just renew it and they will start working again.</p>
  
  <p>The thing is that one more developer works on the same apple developer account and he deleted in the meantime all the expired certificates.</p>
  
  <p>So, I created a new one and I updated the keys on my server. But the push notifications are not working..
  I'm using their feedback service but I do not get any error back. It says that notification transmitted to the device token I'm targeting.</p>
  
  <p>What can be wrong?
  Can the live app get push notifications again without updating it with a new certificate ?</p>
  
  <p>And is it ok if I use an apn certificate on the server that was generated with a different Certificate Signing Request than the certificate that the app was signed with ?</p>