java.io.IOException: Bad packet id 20

I start up the server and attempt to connect to it from my desktop.

The console from the server shows:
$ java -Xmx2048M -Xms1536M -jar minecraft_server.jar nogui
210 recipes
27 achievements
2016-09-24 22:34:26 [INFO] Starting minecraft server version 1.4.7
2016-09-24 22:34:26 [INFO] Loading properties
2016-09-24 22:34:26 [INFO] Default game type: CREATIVE
2016-09-24 22:34:26 [INFO] Generating keypair
2016-09-24 22:34:26 [INFO] Starting Minecraft server on *:25565
2016-09-24 22:34:26 [INFO] Preparing level "world"
2016-09-24 22:34:27 [INFO] Preparing start region for level 0
2016-09-24 22:34:27 [INFO] Done (0.828s)! For help, type "help" or "?"
java.io.IOException: Bad packet id 20
at ef.a(SourceFile:185)
at cg.i(SourceFile:249)
at cg.c(SourceFile:15)
at ch.run(SourceFile:93)

and in the client I get:
Internal Exception: Java.io.IOException: Error while read(...): Connection reset by peer