channels - socket.close() in JS not working on dev_server

[Roberto Saccon]

In javascript I try to close a perfectly working channel socket object. While it works on appengine, on dev server I get the following error:

GET http://192.168.1.2:8080/_ah/channel/dev?command=poll&channel=channel--g1olif-18580476422013912411_0&client=connection-3 500 (Client connection with ID connection-3 not found.)

anything I am doing wrong ??? I am using 1.5.1 SDK with Java

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Roberto