服务器日志有异常信息
Event code: 4005
Event message: 请求的窗体身份验证失败。 原因: 提供的票证已过期。
Event time: 2012/4/27 11:32:39
Event time (UTC): 2012/4/27 3:32:39
Event ID: 07a4bda5efa743e192345adf2ef032a4
Event sequence: 6460
Event occurrence: 111
Event detail code: 50202

Application information:
Application domain: /LM/W3SVC/6/ROOT-1-129799671435659885
Trust level: Full
Application Virtual Path: /
Application Path: E:\szxy\county1\web\
Machine name: S2XYAPP2

Process information:
Process ID: 34124
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Request information:
Request URL: http://county1school.tyxiaoyuan.com/indexlog.aspx
Request path: /indexlog.aspx
User host address: 183.64.169.2
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE

Name to authenticate:

Custom event details:
请问这是怎么回事？如何处理

[解决办法]
cookie 过期 或者是 使用了相同的cookie名，cookie路径 ，machinekey