nginx＋memcached＋tomcat 关于session超时的有关问题

异常信息：
net.spy.memcached.internal.CheckedOperationTimeoutException: Timed out waiting for operation - failing node: /127.0.0.1:11211

在tomcat server.xml中的配置：

<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"  
             memcachedNodes="n1:182.92.214.173:11211"
            sticky="false"  
            sessionBackupAsync="false"  
            lockingMode="auto"  
            sessionBackupTimeout="1800000" 
            requestUriIgnorePattern=".*\.(ico|png|gif|jpg|css|js)$" 
            transcoderFactoryClass="de.javakaffee.web.msm.serializer.kryo.KryoTranscoderFactory" 
            />