某局点WX3508H portal 认证结合第三方认证失败问题

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某局点采用WX3508H做portal结合第三方厂家做认证，发现配置完之后，portal界面可以弹出来，但是输入用户名和密码之后，认证失败，怀疑是portal或者radius 报文交互的有问题，让现场反馈最新配置和debug信息来看

关键debug信息：

*Jun 18 14:29:14:611 2021 H3C PORTAL/7/EVENT: Received request configuration synchronization message from AP 1, message length=104.
*Jun 18 14:29:14:611 2021 H3C PORTAL/7/EVENT: CfgSmooth msg proc, uiAcWebSvrCnt: 1, uiApWebSvrCnt: 1.
*Jun 18 14:29:14:611 2021 H3C PORTAL/7/EVENT: CfgSmooth msg proc, AC FreeRule Count: 4, AP FreeRule Count: 4.
*Jun 18 14:29:14:611 2021 H3C PORTAL/7/EVENT: CfgSmooth msg proc, Rcv msg info, ApMac: 1451-7e0b-x, BssidCnt: 2.
*Jun 18 14:29:14:611 2021 H3C PORTAL/7/EVENT: CfgSmooth msg proc, Rcv msg info, ApMac: 1451-7e0b-x, BssidCnt: 2.
*Jun 18 14:29:14:611 2021 H3C PORTAL/7/EVENT: CfgSmooth msg proc, AP 1 Bssid info need compare, AcBssidCnt: 2, ApBssidCnt: 2.
*Jun 18 14:29:18:147 2021 H3C PORTAL/7/ERROR: Packet source unknown. Server IP:134.x.x.x, VRF Index:0
*Jun 18 14:29:28:221 2021 H3C PORTAL/7/ERROR: Packet source unknown. Server IP:134.x.x.x., VRF Index:0
*Jun 18 14:29:38:283 2021 H3C PORTAL/7/ERROR: Packet source unknown. Server IP:134.x.x.x, VRF Index:0

从debug信息来看提示的portal报文无法识别，进一步查看设备的配置，发现portal server 下有vpn实例的配置，但是设备互联接口并没有配置vpn实例。

portal server np-server
ip 134.x.x.x vpn-instance admin key cipher $c$3$jiP5Pa3w5mcbRzh4WlAfq3N/Gx4uIolN3po30tM=
server-type cmcc

后续让客户把vpn实例删除之后，重新测试，认证通过。