Configure portal server address in some domain at MA5200. User is not enforced to designated portal page when he accesses network.
1. Newly built a test domain and configure non-authentication and non-account. When user re-dial and access network, the first-opened IE page is redirected as designated portal page. Portal server is normal. MA5200 configuration and PORTAL are normal. It is doubted that the cooperation with Radius server is problematic.
2. Open Radius debugging information and details are as follows:
Radius Received a Packet
Server Template: 0
Server IP : 188.8.131.52
Server Port : 1812
Code : 2
Len : 102
ID : 10
[Framed-Protocol(7) ] [6 ] 
[Acct_Interim_Interval(85) ] [6 ] 
[Input-Burst-Size(26-1) ] [6 ] 
[Input-Average-Rate(26-2) ] [6 ] 
[Input-Basic-Rate(26-3) ] [6 ] 
[Output-Burst-Size(26-4) ] [6 ] 
[Output-Average-Rate(26-5) ] [6 ] 
[Output-Basic-Rate(26-6) ] [6 ] 
[Connect-ID(26-26) ] [6 ] 
[PortalURL(26-27) ]  [www.gzrail.net]
It is found that Radius server floods the address of portal server. Ping it and it cannot communicate. MA5200G will give priority to attribute flooded by Radius. So user side cannot see correct portal page.
3. Cancel portal address flooded by Radius server and configure local portal server address in the domain. The problem is solved.
RADIUS floods a forced portal address and the address cannot be reached. So user cannot realize enforced PORTAL service.