在于其它厂商认证服务器做portal对接事，终端获取地址后无法弹出portal页面，手动输入页面地址可以认证。debug 日志如下：AC上配置方法如下：

# wlan service-template 1  ssid WiFi_TSET  client forwarding-location ap  bss transition-management enable portal enable method direct  portal domain Student portal bas-ip 10.100.255.11  portal apply web-server AAA portal apply mac-trigger-server test  service-template enable  #                      radius scheme Student  primary authentication 172.31.31.5  primary accounting 172.31.31.5  key authentication simple h3c7521340  key accounting simple h3c7521340  user-name-format without-domain  nas-ip 10.100.255.11 #                                     

radius session-control enable  #  domain Student authorization-attribute idle-cut 30 10240  authentication portal radius-scheme Student  authorization portal radius-scheme Student  accounting portal radius-scheme Student   #

portal server test  ip 172.31.31.5 key simple XXX  server-type cmcc                       #

portal web-server AAA url http://172.31.31.5  url-parameter ssid ssid url-parameter wlanuserip source-address  url-parameter wlanacname value AC  server-type cmcc                          #

portal free-rule 0 source ip any destination ip 144.144.144.144 255.255.255.255  portal free-rule 5 source ip any destination ip any   #

portal roaming enable#

undo portal refresh arp enable