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    Import the server certificate into your truststore.

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javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown	at sun.security.ssl.Alerts.getSSLException(Unknown Source)	at sun.security.ssl.Alerts.getSSLException(Unknown Source)	at sun.security.ssl.SSLSocketImpl.recvAlert(Unknown Source)	at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)	at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)	at sun.security.ssl.SSLSocketImpl.writeRecord(Unknown Source)	at sun.security.ssl.AppOutputStream.write(Unknown Source)	at java.io.OutputStream.write(Unknown Source)	at com.ibm.pushworks.server.notification.apns.ApnsConnectionImpl.sendMessage(ApnsConnectionImpl.java:302)	at com.ibm.pushworks.server.notification.apns.ApnsConnectionImpl.sendMessage(ApnsConnectionImpl.java:292)	at com.notnoop.apns.internal.ApnsPooledConnection$2.run(ApnsPooledConnection.java:47)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)