local client connection OK,but remote client not connection!

use "ejabberdctl live" list information:

192.168.0.105=>192.168.0.105 Connection OK!
192.168.0.100=>192.168.0.105 Connection failure.

=INFO REPORT==== 30-May-2010::12:18:13 ===
I(<0.367.0>:ejabberd_listener:232) : (#Port<0.3732>) Accepted connection {{192,168,0,105},58627} -> {{192,168,0,105},5269}

=INFO REPORT==== 30-May-2010::12:18:13 ===
I(<0.420.0>:ejabberd_s2s_out:415) : wait for validation: localhost -> 192.168.0.105 (closed)

=INFO REPORT==== 30-May-2010::12:24:41 ===
I(<0.366.0>:ejabberd_listener:232) : (#Port<0.3735>) Accepted connection {{192,168,0,100},1964} -> {{192,168,0,105},5222}