[Modules] can not use multi-radius server

[modversion]

I want to run mod_auth_xradius in multi-radius server mode,but it return
failed in the authentication.

My config like :

AuthXRadiusAddServer "ip1:1812" "key"
AuthXRadiusAddServer "ip2:1812" "key"
AuthXRadiusAddServer "ip3:1812" "key"

The error info was:

[Wed Jul 01 20:06:07 2015] [notice] xradius: val size: '0'
[Wed Jul 01 20:06:07 2015] [error] [client 192.168.1.2] xradius: Failed to
add server ':1812': (-1) : host not found
[Wed Jul 01 20:06:07 2015] [error] [client 192.168.1.2] user jacky:
authentication failure for "/": Password Mismatc

How can I fit it ?Thank you !
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