I managed to fix it:
set the urls platform.js
http instead of https.
installed ANT and set some environement vars:
ANT_HOME c:\dev\apache-ant-1.9.3\ ANT_OPTS -Dhttp.proxyHost=http://proxy.myAddress.de -Dhttp.proxyPort=3000 PATH %ANT_HOME%\bin
set some additonal Adnroid environment vars:
PATH %ANDROID_HOME%\tools;%ANDROID_HOME%\platform-tools
Hope this helps others