Connection reset by peer

I don't know if this is an issue of PyAPNs, but I don't know where else to ask. It worked before but doesn't anymore.

Since about 1 week ago our push notifications aren't getting through. I tried to google for "Connection reset by peer" but didn't get any answers that could lead to a solution.

I double checked the certificates, so they aren't expired
Ran the test code and got the same error

2015-08-18 14:10:21,380 ERROR fus.push push_user (65) [Errno 104] Connection reset by peer
Traceback (most recent call last):
  File "./fus/push.py", line 62, in push_user
    push_ios(message, token.token, section, badge.counter, url, data)
  File "./fus/push.py", line 38, in push_ios
    apns.gateway_server.send_notification(token, payload)
  File "/home/admin/venv_kb/local/lib/python2.7/site-packages/apns.py", line 544, in send_notification
    self.write(self._get_notification(token_hex, payload))
  File "/home/admin/venv_kb/local/lib/python2.7/site-packages/apns.py", line 273, in write
    return self._connection().write(string)
  File "/home/admin/venv_kb/local/lib/python2.7/site-packages/apns.py", line 254, in _connection
    self._connect()
  File "/home/admin/venv_kb/local/lib/python2.7/site-packages/apns.py", line 230, in _connect
    self._ssl = wrap_socket(self._socket, self.key_file, self.cert_file)
  File "/usr/lib/python2.7/ssl.py", line 381, in wrap_socket
    ciphers=ciphers)
  File "/usr/lib/python2.7/ssl.py", line 143, in __init__
    self.do_handshake()
  File "/usr/lib/python2.7/ssl.py", line 305, in do_handshake
    self._sslobj.do_handshake()
error: [Errno 104] Connection reset by peer

djacobs / PyAPNs

Connection reset by peer #130