CKFinder works in Chrome but not in IE 8 and Firefox, why?

After integrate ckfinder into my existing ASP.Net application, the ckfinder works well in Chrome. When comes to IE8 and Firefox, it shows the following error, anyone knows why?


URL requested: "http://localhost/superbuy.my/cp/ckfinder/core/connector/aspx/connector.aspx?command=Init&langCode=en"
Server response:
Status: 200
Response text:
<?xml version="1.0" encoding="utf-8"?><Connector><Error number="0" /><ConnectorInfo enabled="true" s="" c="xxxx" thumbsEnabled="true" thumbsUrl="/ckfinder/userfiles/_thumbs/" thumbsDirectAccess="false" /><ResourceTypes><ResourceType name="Files" url="/ckfinder/userfiles/files/" allowedExtensions="7z,aiff,asf,avi,bmp,csv,doc,fla,flv,gif,gz,gzip,jpeg,jpg,mid,mov,mp3,mp4,mpc,mpeg,mpg,ods,odt,pdf,png,ppt,pxd,qt,ram,rar,rm,rmi,rmvb,rtf,sdc,sitd,swf,sxc,sxw,tar,tgz,tif,tiff,txt,vsd,wav,wma,wmv,xls,zip" deniedExtensions="" hash="6df2063d8154e6b0" defaultView="Thumbnails" hasChildren="false" acl="255" /><ResourceType name="Images" url="/ckfinder/userfiles/images/" allowedExtensions="bmp,gif,jpeg,jpg,png" deniedExtensions="" hash="6bd1ec7383dc1e8b" defaultView="Thumbnails" hasChildren="false" acl="255" /><ResourceType name="Flash" url="/ckfinder/userfiles/flash/" allowedExtensions="swf,flv" deniedExtensions="" hash="45e0374a683a70a9" defaultView="Thumbnails" hasChildren="false" acl="255" /></ResourceTypes></Connector><div align="center"><b><font color="#FF0000;">THIS SITE MAY BE RUNNING UNLICENSED <a href="http://www.aspdotnetstorefront.com/mylicenses.aspx" target="_blank">ASPDOTNETSTOREFRONT.COM</a> SOFTWARE!<br/><a href="http://www.aspdotnetstorefront.com/mylicenses.aspx" target="_blank">CLICK HERE TO ACTIVATE YOUR LICENSE</a></font></b><br/></div>