What would cause this on Samba 4.0.4 stable?

[David Pendell]

What would cause this on Samba 4.0.4 stable?

d.p.

root at kdc:/usr/local/samba# bin/samba-tool drs showrepl
Failed to connect host 192.168.199.13 on port 135 -
NT_STATUS_CONNECTION_REFUSED
Failed to connect host 192.168.199.13 (kdc.example.com) on port 135 -
NT_STATUS_CONNECTION_REFUSED.
ERROR(<class 'samba.drs_utils.drsException'>): DRS connection to
kdc.example.com failed - drsException: DRS connection to
kdc.example.comfailed: (-1073741258, 'The connection was refused')
  File "/usr/local/samba/lib/python2.7/site-packages/samba/netcmd/drs.py",
line 39, in drsuapi_connect
    (ctx.drsuapi, ctx.drsuapi_handle, ctx.bind_supported_extensions) =
drs_utils.drsuapi_connect(ctx.server, ctx.lp, ctx.creds)
  File "/usr/local/samba/lib/python2.7/site-packages/samba/drs_utils.py",
line 54, in drsuapi_connect
    raise drsException("DRS connection to %s failed: %s" % (server, e))