Incorrect/out of date link to minecraft_server.jar

Running minecraft_server.jar with the command line:
java -Xms1536M -Xmx1536M -jar <path>/server.jar
(server.jar is a symbolic link to minecraft_server.jar)
On trying to list servers with the remote client (Multiplayer) the server generates the message:
java.io.IOException: Bad packet id 22
at jc.a(SourceFile:139)
at my.h(SourceFile:190)
at my.c(SourceFile:10)
at uj.run(SourceFile:77)
2015-11-03 14:54:24 [INFO] /xxx.xxx.xxx.xxx:ppppp lost connection
(xxx.xxx.xxx.xxx:ppppp is my IP:port number)

Client shows "Can't connect to server."
I have tried moving minecraft_server.jar into the same directory as the server.properties instead of using the symbolic link, with the same result.