YP problem

[keijo tuominen]

What's wrong with my master yp server because it refuses all smtp 
connections:
Trying host
Connected to host
Escape character is '^]'
Connections closed by foreign host.

All yp clients accept smtp connections just fine.
So what's wrong with master server.
--
 *        Tuominen Keijo              *           E-mail adress:            *
 *        Vuorimiehentie 5            *        Keijo.Tuominen at vtt.fi        *
 *     SF-02150 Espoo, Finland        *              TELEFAX:       	    *
 * Phone: 90-4564295 Home: 90-538606  *            +358 0 460648  	    *	


--
 *        Tuominen Keijo              *           E-mail adress:            *
 *        Vuorimiehentie 5            *        Keijo.Tuominen at vtt.fi        *
 *     SF-02150 Espoo, Finland        *              TELEFAX:       	    *
 * Phone: 90-4564295 Home: 90-538606  *            +358 0 460648  	    *