Change Domain Password From MacOSX
From ITSwiki
Should you "forget" to change your password when promptet I usually just prompt in a Terminal Window:
smbpasswd -r adserv1.compute.dtu.dk -U jowa
- where U off course need to know wich Server to address (adserv1.compute.dtu.dk) and then use your own ID (jowa)
You off course need to be cabeled to the network.