"Unknown Session" using C2DS


when communicating with C2 data servers I randomly get “Unknown Session” messages. First I obtain a sessionid and then I use this to get. i.e. the trade signal history. Sometimes this works, sometimes not.

I use Java 's HttpURLConnection to connect and Digester to process the resulting XML data.

I use the correct URLs and I even sent the sessionid as a cookie.

PS. : It always works when testing it using a browser.

Any ideas ?

Best regards,