READ_ERROR_FROM_CLIENT

When I try and attach a large file through the wl-proxy, I get a READ_ERROR_FROM_CLIENT:
trying to POST /jive4/attach.jspa, Client-Auth reports: Cannot buffer client data
-wl-proxy reports: IO error reading POST data at line 628 of proxy.cpp, system error: The operation completed successfully.
-exception occurred: READ_ERROR_FROM_CLIENT [os error=0, line 629 of proxy.cpp]: reading client POST data failed.
What do you guys think it is?

Any help on above problem pls
Dataadapter.fill (ds,"DATATABLE")
Thanks

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