Which username and password do we have to fill in host credentials section when using oracle 10g database control?

As per my knowledge, it is OS username and password.

My machine is on domain. I have tried using both my domain account and local administrator account but it returns the following error.

Validation Error
Examine and correct the following errors, then retry the operation:
Host Credentials - ERROR: Wrong password for user


Passwords of both accounts are tested after logging off and then logging in.

Do we have to specify some other username and password?