[Samba] "Attempt to bind using schannel without successful serverauth2" in 3.0.20 logs

[Chris]

Samba logs show many of these:

[2005/09/10 10:15:56, 0] rpc_server/srv_pipe.c:api_pipe_bind_req(981)
  Attempt to bind using schannel without successful serverauth2
[2005/09/10 10:26:04, 0] rpc_server/srv_pipe.c:api_pipe_bind_req(981)
  Attempt to bind using schannel without successful serverauth2
[2005/09/10 11:26:01, 0] rpc_server/srv_pipe.c:api_pipe_bind_req(981)
  Attempt to bind using schannel without successful serverauth2

This is on a 3.0.20 (with patches) PDC.

Anyhone know what can cause this message?
Is it just informative or does something need to be fixed?

Thanks.

Chris