Problems with mms streaming to wmp

[neol84]

When is setup a stream to transcode from rtsp from an axis 207 to wmp it all seems to be working correctly.
I used the following commands in de vlm mode.

new cam1 broadcast enabled
setup cam1 input rtsp://IPCAM:554/mpeg4/media.amp
setup cam1 output #transcode{vcodec=WMV2,vb=512,scale=1}:duplicate{dst=std{access=mmsh,mux=asfh,url=SERVERIP:8001}}

If i test from inside the network it works perfectly. But when i test it from outside the network it only works 20% of the time (i've forwarded the ports correctly). WMP can find the stream and starts buffering and then stops and after a while tries to reconnect. And it after this it doesn't work any longer.

Does anyone has the same problems or solved it??