After a two day debug session I found, that Kaspersky Antivirus 6.0 messes up the HTTP communication. By default KAV intercepts all traffic on port 8080. This hinders applications talking to a glassfish servlet using a HTTP POST with transfer encoding "chunked" to properly transfer the data. Communication not in chunked-mode, with a Content-Lenght header field, does not seem to be affected. In order to fix this, change the KAV settings that port 8080 is no longer intercepted.
Regards
Heiko
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