getting following error while trying to join my linux box to domain

[vishal]

[2009/08/24 10:19:16, 0] libads/kerberos.c:ads_kinit_password(146)
  kerberos_kinit_password administrator at TEST.VISHAL.COM failed: Cannot resolve network address for KDC in requested realm
[2009/08/24 10:19:16, 0] utils/net_ads.c:ads_startup(186)
  ads_connect: Cannot resolve network address for KDC in requested realm
[2009/08/24 10:19:16, 0] rpc_client/cli_netlogon.c:cli_nt_setup_creds(256)
  cli_nt_setup_creds: request challenge failed
[2009/08/24 10:19:16, 0] rpc_client/cli_netlogon.c:cli_nt_setup_creds(256)
  cli_nt_setup_creds: request challenge failed
[2009/08/24 10:19:16, 0] utils/net_rpc_join.c:net_rpc_join_newstyle(319)
  Error domain join verification (reused connection): NT_STATUS_INVALID_COMPUTER_NAME