WX3540X debugging dot1x all调试信息分析

AC上配置的802.1x认证，但是debug信息时，发现卡在如下地方：

RADIUS/7/EVENT: PAM_RADIUS: Processing RADIUS authentication.//进行RADIUS认证 

RADIUS/7/EVENT: PAM_RADIUS: Sent authentication request successfully.// 成功发送认证请求 

RADIUS/7/EVENT: Processing AAA request data.// 处理AAA请求数据 

RADIUS/7/EVENT: Got request data successfully, primitive: authentication.// 成功接收到用户的认证请求，原语是认证

RADIUS/7/EVENT: Getting RADIUS server info. 

RADIUS/7/EVENT: Got RADIUS server info successfully.// 成功获取RADIUS服务器信息 

RADIUS/7/EVENT: Created request context successfully.// 成功创建请求上下文 

RADIUS/7/EVENT: Created request packet successfully, dstIP: x.x.x.x, dstPort: 1812, VPN instance: --(public), socketFd: 334, pktID: 8.// 成功创建认证请求报文，目的地址是x.x.x.x，目的端口是1812，VPN实例是public，套接字是334，报文ID是8

RADIUS/7/EVENT: Added packet socketfd to epoll successfully, socketFd: 334.

RADIUS/7/EVENT: Mapped PAM item to RADIUS attribute successfully.// 成功将PAM数据项映射为RADIUS属性 

RADIUS/7/EVENT: Got RADIUS username format successfully, format: 0. 

RADIUS/7/EVENT: Added attribute user-name successfully, user-name: test.// 成功添加用户名属性，属性值是test 

RADIUS/7/EVENT: Filled RADIUS attributes in packet successfully.// 成功填充报文属性，并构建认证请求报文

RADIUS/7/EVENT: Composed request packet successfully. 

RADIUS/7/EVENT: Created response timeout timer successfully.// 成功创建应答超时定时器

RADIUS/7/EVENT: Sent request packet and create request context successfully.// 成功发送认证请求报文，并创建请求上下文 

RADIUS/7/EVENT: Added request context to global table successfully.// 成功将请求上下文加入全局上下文信息表 

RADIUS/7/EVENT: Response timed out. //响应超时

RADIUS/7/EVENT: Found request context, dstIP: x.x.x.x; dstPort: 1812; VPN instance: --(public); socketfd: 334; pktID:8.// 查找到请求上下文 

RADIUS/7/EVENT: Retransmitting request packet, currentTries: 2, maxTries: 3.  //然后开始重新认证

请帮忙看看这是为什么？需要去排查哪里呢？