无法访问某网址，无痕窗口和其它浏览器却可以

我在360安全浏览器中访问http://www.dajiangtai.com/，显示“网页无法访问”（前天还能正常访问呢），我试了下谷歌浏览器和IE都可以访问，在360安全浏览器的无痕窗口也能正常访问，请问这是怎么回事？

您好，

本地测试问题没有复现，建议您先按F1打开浏览器医生进行全选修复，将所有扩展全部停用或卸载试试看

您好，用9.1试试，http://down.360safe.com/se/360se9.1.0.310.exe

一个半月后此问题又出现了……情况和上次一模一样，在360安全浏览器的无痕窗口仍能正常访问，能否帮忙找个永久的解决方法呢？而且此网站的其它页面上报了以下错误：
HTTP Status 500 - Race condition encountered: attempted to load session[CBB365E114A226AF10FDD7472ABB3065] which has been created but not yet serialized.

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type Exception report

message Race condition encountered: attempted to load session[CBB365E114A226AF10FDD7472ABB3065] which has been created but not yet serialized.

deion The server encountered an internal error that prevented it from fulfilling this request.

exception

java.lang.IllegalStateException: Race condition encountered: attempted to load session[CBB365E114A226AF10FDD7472ABB3065] which has been created but not yet serialized.        com.radiadesign.catalina.session.RedisSessionManager.loadSessionFromRedis(RedisSessionManager.java:389)        com.radiadesign.catalina.session.RedisSessionManager.findSession(RedisSessionManager.java:315)        org.apache.catalina.connector.Request.doGetSession(Request.java:2861)        org.apache.catalina.connector.Request.getSessionInternal(Request.java:2516)        com.radiadesign.catalina.session.RedisSessionHandlerValve.invoke(RedisSessionHandlerValve.java:28)        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)        org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)        org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008)        org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)        org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)        java.lang.Thread.run(Thread.java:722)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.40 logs.

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Apache Tomcat/7.0.40

我已通过清除cookies解决了（上次我打开浏览器医生进行全选修复都没有解决，不知为什么）。