javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

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Unrecognized SSL message, plaintext connection?
javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?
at com.sun.net.ssl.internal.ssl.InputRecord.handleUnknownRecord(InputRecord.java:521)
at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:355)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:722)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1029)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1056)
at org.jivesoftware.smack.XMPPConnection.proceedTLSReceived(XMPPConnection.java:1119)
at org.jivesoftware.smack.PacketReader.parsePackets(PacketReader.java:316)
at org.jivesoftware.smack.PacketReader.access$000(PacketReader.java:43)

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