sth wrong when logon on BTEQ

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sth wrong when logon on BTEQ

here is hosts file:

127.0.0.1 localhost DemoTDATcop1
127.0.0.1 jiangyo

but when I tried to log betq using command:

.logon DemoTDAT/dbc,dbc;

the system report error:
*** CLI error: MTDP: EM_NOHOST(224): name not in HOSTS file or names database.

*** Return code from CLI is: 224
*** Error: Logon failed!

what should I do?