Host does not exist


I’ve got to change my dns server and at these moment it’s works fine. All host resolve fine ( websites).
The problem that i’ve got is these: wemin index server, when i put a login and password to login trough webmin , webmin say Host does not exist, but if i not put these , it can reslove the name server with

I can not find the problem, so how can resolve these?


Daniel Witoszek Arias