[Samba] Invalid user name when adding machine to domain

[Richmond Dyes]

I am getting an error when trying to add a machine to my domain.  I look 
at the log for that machine and  this is what I get



[2005/07/02 20:54:51, 2] smbd/sesssetup.c:setup_new_vc_session(608)
  setup_new_vc_session: New VC == 0, if NT4.x compatible we would close 
all old resources.
[2005/07/02 20:54:51, 2] smbd/sesssetup.c:setup_new_vc_session(608)
  setup_new_vc_session: New VC == 0, if NT4.x compatible we would close 
all old resources.
[2005/07/02 20:54:51, 2] auth/auth.c:check_ntlm_password(305)
  check_ntlm_password:  authentication for user [admin] -> [root] -> 
[root] succeeded
[2005/07/02 20:54:52, 2] rpc_server/srv_samr_nt.c:_samr_lookup_domain(2482)
  Returning domain sid for domain XXXXXXX -> 
S-1-5-21-1984118162-790530758-327830036
useradd: invalid user name 'paulgrav$'
[2005/07/02 20:54:53, 2] smbd/server.c:exit_server(571)
  Closing connections

Any ideas of what could be causing this?