Why I can't connect two edge to origin ?

Hi,
I have two edge server and I config Vhost.xml as same but I can request streaming one edge.
:::This my config
<RouteEntry>*:* ; 192.168.1.10:1935</RouteEntry>
-> Edge#1 = 192.168.1.11
-> Edge#2 = 192.168.1.12
-> Origin = 192.168.1.10
If I start edge#1 before edge#2 I can request stream from edge#1 but edge#2 it not work.
If I start edge#2 before edge#1 I can request stream from edge#2 but edge#1 it not work.

I try to check about max connection for edge server in vhost.xml at origin server but config is
<MaxEdgeConnections>-1</MaxEdgeConnections>

I don't know why about this ploblem.

Thanks.