别人装了一个服务器，
昨天正常使用，今天突然出错了。
管理中心可以使用，不用登录的。
登录网站时 反复验证进不去 用场管理员 也不行。
系统日志 错误是： Security-Kerberos
The Kerberos client received a KRB_AP_ERR_MODIFIED error from the server DVSharePt.SG.Farm. The target name used was HTTP/SGASESPDEV01.ap.loreal.intra. This indicates that the target server failed to decrypt the ticket provided by the client. This can occur when the target server principal name (SPN) is registered on an account other than the account the target service is using. Please ensure that the target SPN is registered on, and only registered on, the account used by the server. This error can also happen when the target service is using a different password for the target service account than what the Kerberos Key Distribution Center (KDC) has for the target service account. Please ensure that the service on the server and the KDC are both updated to use the current password. If the server name is not fully qualified, and the target domain (AP.LOREAL.INTRA) is different from the client domain (AP.LOREAL.INTRA), check if there are identically named server accounts in these two domains, or use the fully-qualified name to identify the server.
------解决思路----------------------
遇到过类似问题，有几种可能：
1、系统时间跟域控不同步；
2、本地环回；
3、域名加的有问题；
4、账号密码过期；
5、备用访问映射。
暂时就想到这些...
------解决思路----------------------
应该是时间不对了吧？一般是这个情况
------解决思路----------------------
我见过一直弹窗，然后查了很久原因，发现User密码记错了
------解决思路----------------------
前端的时间，和域控不一致；或者前端的时间，和所在物理机同步，不和域控同步，这样就会验证通不过，各种账号不好使；
------解决思路----------------------
但是从错误信息考虑的话，也可能是这个Kerberos验证出问题了，没做过这种的
你看看这个，说有好多原因啊
Check