It looks like you have to add the maxPostSize to:
<Connector port="8399" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8343" maxPostSize="0"/>
at server.xml.
On my first test it works fine, Thanks a lot for Bjorn.
I will test it on Monday more detailled and if there is still any problem i will come back here. otherwise this is the solution.