ARCMAIN Error : Name not in HOSTS file or names database

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ARCMAIN Error : Name not in HOSTS file or names database

Hi,

When i tried to backup the table, getting below error, though given correct connection info (database,user name, pwd)
05/26/2008 17:08:48 *** Failure 0224:MTDP: EM_NOHOST(224): name not in HOSTS
file or names database.

05/26/2008 17:08:48 ARCMAIN TERMINATED WITH SEVERITY 12

Please help to resove this kind of issue.

Thanks.