The underlying connection was closed错误
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今天理IIS上Asp.net程序的所有报错日志，发现好报The underlying connection was closed: Unable to connect to the remote server. 于是搜了下，发现很多人遇到这个异常，可是却没有标准的解决方案，一般有一下几种。
1.如果用了代理，设置正确。
2.如果用了firewall，将firewall禁掉试试。
3.将Lan设置中的Automatically Detect Settings禁掉。
4.重装.Net Framework。
5.如果用了抓取，可以将HttpWebRequest的KeepAlive属性设置为false，HttpWebRequest的KeepAlive属性默认是true
对应我线上的程序，1、2、3、4都可以排除，我的就是抓取时报这个错，采用了第5种方法后，异常消失了。
come from http://www.2cto.com/kf/201301/182249.html
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