Whats weird is the fact that when i ripped html code inside RadChart
<img border="0" style="border-width: 0px;" alt="" src="ChartImage.axd?UseSession=false&ImageName=cxSxZrcRtY7mpmaLAXDnyVOsFOrcG2%2f6MLfOU7he2ZiHmE5e4lFZCYuY9Wi7zPJZZvPV2JeyBExAxVIs51zbGA%3d%3d&imageFormat=Png"/>
<div id="dnn_ctr401_ClientSources_rcGroup" class="" style="height: 400px; width: 500px;">
and changed it to point directly to correct address (http://192.168.1.1/ChartImage.axd?...) image is displayed ok.