unable to join windows 2K3 domain

["Adeel Akbar" <aakbar i2cinc com>]

Whenever I try to join my fedora workstation with windows 2k3 domain its
shows me below mentioned message

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[2009/02/17 02:56:32, 0] libads/kerberos.c:ads_kinit_password(228)
  kerberos_kinit_password FEDORA1$ I2C COM failed: Preauthentication failed
Failed to join domain: Logon failure
ADS join did not work, falling back to RPC...
Joined domain IC.

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Please help me out, I want to join with domain. Thank you 

Adeel Akbar