asp.net网站频繁假死，IIS日志记录Connection_Dropped

我们自己开发的asp.net站点，一天有可能出现N次假死，具体表现就是用户端速度变慢然后突然没有响应，退出重新登录，网页加载速度超慢，甚至无法访问。之后只需要对IIS的进程池进行回收或重启IIS就恢复正常。

分析日志后会发现大量的请求被抛弃，以下为httperr中的部分错误记录：

2010-09-01 02:36:08 192.168.1.161 3462 192.168.1.8 188 HTTP/1.1 GET /AutoGetSysTx.ashx?siteid=300240&_dc=1283308530812 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.163 3337 192.168.1.8 188 HTTP/1.1 GET /AutoGetSysTx.ashx?siteid=300033&_dc=1283308499734 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.103 3224 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301189&node=33&_dc=1283308565734 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.103 3226 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301189&node=30&_dc=1283308567437 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.103 3225 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301189&node=33&_dc=1283308569875 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.133 4490 192.168.1.8 188 HTTP/1.1 POST /nosurecust_sitemanage.aspx?siteid=301416 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.33 2145 192.168.1.8 188 HTTP/1.1 GET /login.aspx - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.29 4393 192.168.1.8 188 HTTP/1.1 GET /AutoGetSysTx.ashx?siteid=300913&_dc=1283308444625 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.117 1771 192.168.1.8 188 HTTP/1.1 POST /CallOut.aspx?caller=9071&callee=03353626084&custid=23888&custQuhao=0335&datenow=2010-09-01+10%3a33%3a21&ddd=9071_03353626084 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.204 3031 192.168.1.8 188 HTTP/1.1 GET /index.aspx - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.29 4399 192.168.1.8 188 HTTP/1.1 GET /AutoGetSysTx.ashx?siteid=301260&_dc=1283308445562 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:08 192.168.1.93 1772 192.168.1.8 188 HTTP/1.1 GET /AutoGetSysTx.ashx?siteid=301382&_dc=1283308684359 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.71 1434 192.168.1.8 188 HTTP/1.1 GET /AutoGetSysTx.ashx?siteid=300228&_dc=1283308646765 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.55 1449 192.168.1.8 188 HTTP/1.1 POST /CallOut.aspx?caller=9098&callee=013513019999&custid=22570&custQuhao=0317&datenow=2010-09-01+10%3a33%3a28&ddd=9098_013513019999 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.59 2045 192.168.1.8 188 HTTP/1.1 GET /AutoGetSysTx.ashx?siteid=301231&_dc=1283308489718 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.55 1455 192.168.1.8 188 HTTP/1.1 POST /CallOut.aspx?caller=9098&callee=013513019999&custid=22570&custQuhao=0317&datenow=2010-09-01+10%3a33%3a28&ddd=9098_013513019999 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4579 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301413&node=33&_dc=1283308421500 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.33 2148 192.168.1.8 188 HTTP/1.1 GET /login.aspx - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.73 1291 192.168.1.8 188 HTTP/1.1 GET /RecordTotal.aspx?siteid=301296 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4580 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301413&node=33&_dc=1283308424406 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4581 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301413&node=30&_dc=1283308425078 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.51 2008 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=300734&node=33&_dc=1283308587421 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4582 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301413&node=25&_dc=1283308426093 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4592 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301413&node=20&_dc=1283308426578 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4583 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301413&node=16&_dc=1283308427312 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4593 192.168.1.8 188 HTTP/1.1 GET /AutoGetMenu.ashx?siteid=301413&node=5&_dc=1283308428343 - 63789781 Connection_Dropped phoneCenter
2010-09-01 02:36:38 192.168.1.133 4590 192.168.1.8 188 HTTP/1.1 POST /nosurecust_sitemanage.aspx?siteid=301416 - 63789781 Connection_Dropped phoneCenter

其中phoneCenter是我们站点单独设置的IIS进程池。

各位遇到过类似问题的大大们，给点提示吧，实在是不知道问题出在什么地方了。

程序问题吧，估计是那个位置内存没有释放好！