Radius authentication through management interface fails

On Cloud Engine 6800 customer was using radius authentication for SSH via management interface, the authentication failed.

Software version CE6850HI-V100R005C10SPC200.cc.

configuration;

#

radius server group rtve
radius server shared-key-cipher xxxxxxxxxxxxxxxxxx
radius server authentication x.x.128.28 1812
radius server accounting x.x.128.28 1813
radius server retransmit 2
radius server source interface MEth0/0/0
radius server user-name domain-excluded

#
authentication-scheme default
  authentication-mode radius local
#
authentication-scheme auth
  authentication-mode local radius
#
authorization-scheme default
#
accounting-scheme default
#
accounting-scheme abc
  accounting-mode radius
#
domain default
#
domain default_admin
  authentication-scheme auth
  accounting-scheme abc
  adminuser-priority 15
  radius server group rtve

#
stelnet server enable
ssh user admin
ssh user admin authentication-type all
ssh user admin service-type all
ssh authorization-type default aaa
#
ssh server cipher aes256_ctr aes128_ctr aes256_cbc aes128_cbc 3des_cbc blowfish_cbc
ssh server hmac sha2_256_96 sha2_256 sha1 sha1_96
#
interface MEth0/0/0
ip address 10.50.226.89 255.255.255.240