LoadRunner脚本问题

　　录制了一段loadrunner测试脚本，但是回放的时候总是跑不通，总是报错12002。报错的位置是在请求ajax文件的web_custom_request函数处。

报错的代码位置：

 web_custom_request("ReverseAjax.dwr",
        "URL=http://10.133.210.49:9011/khyx/dwr/call/plainpoll/ReverseAjax.dwr",
        "Method=POST",
        "Resource=0",
        "RecContentType=text/javascript",
        "Referer=http://10.133.210.49:9011/khyx/um/umtmenu/prepareAll.do",
        "Snapshot=t70.inf",
        "Mode=HTTP",
        "EncType=text/plain",
        "Body=windowName=main\ncallCount=1\nbatchId=2\ninstanceId=0\npage=%2Fkhyx%2Fum%2Fumtmenu%2FprepareAll.do\nscriptSessionId=3vg0y$s*wR9Y3tSH81LnfXFslBk/yLFslBk-iLQy*g2fy\npartialResponse=0\n",
        LAST);

--------------------------------------------------------------------------------------------------

报错内容：

Action.c(603): Error -27492: "HttpSendRequest" failed, Windows error code=12002 and retry limit (0) exceeded for URL="http://10.133.210.49:9011/khyx/dwr/call/plainpoll/ReverseAjax.dwr" [MsgId: MERR-27492]

--------------------------------------------------------------------------------------------------

录制的时候用的url-based 方式，reverseAjax使用的comet模式。有没牛人遇到过这个问题，求高手