Cannot join as secondary DC - samba 4.2.2 - <bug?>

[bogdan_bartos]

On the primary DC:

[root at fileserver sbin]# cat /etc/resolv.conf
# Generated by NetworkManager
domain fileserver.specified.ca
nameserver 192.168.100.253

[root at fileserver sbin]# cat /etc/hosts
127.0.0.1               localhost.localdomain localhost
192.168.100.253 fileserver.fileserver.specified.ca   fileserver
::1             localhost6.localdomain6 localhost6

On the secondary DC:

[root at backupdc bin]# cat /etc/resolv.conf
# Generated by NetworkManager
192.168.100.242 backupdc.fileserver.specified.ca      backupdc
nameserver 192.168.100.253

[root at backupdc bin]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4
localhost4.localdomain4
192.168.100.242 backupdc.fileserver.specified.ca        backupdc
::1         localhost localhost.localdomain localhost6
localhost6.localdomain6

And...I get the same error (I did restart samba on the pDC after the
changes):

[root at backupdc bin]# kinit administrator
Password for administrator at FILESERVER.SPECIFIED.CA:
Warning: Your password will expire in 41 days on Sat 18 Jul 2015 01:58:01 PM
MDT

[root at backupdc bin]# ./samba-tool domain join fileserver.specified.ca DC
-Uadministrator --realm=FILESERVER.SPECIFIED.CA
Finding a writeable DC for domain 'fileserver.specified.ca'
ERROR(exception): uncaught exception - Failed to find a writeable DC for
domain 'fileserver.specified.ca'
  File
"/usr/local/samba/lib64/python2.7/site-packages/samba/netcmd/__init__.py",
line 175, in _run
    return self.run(*args, **kwargs)
  File
"/usr/local/samba/lib64/python2.7/site-packages/samba/netcmd/domain.py",
line 613, in run
    machinepass=machinepass, use_ntvfs=use_ntvfs, dns_backend=dns_backend)
  File "/usr/local/samba/lib64/python2.7/site-packages/samba/join.py", line
1161, in join_DC
    machinepass, use_ntvfs, dns_backend, promote_existing)
  File "/usr/local/samba/lib64/python2.7/site-packages/samba/join.py", line
79, in __init__
    ctx.server = ctx.find_dc(domain)
  File "/usr/local/samba/lib64/python2.7/site-packages/samba/join.py", line
267, in find_dc
    raise Exception("Failed to find a writeable DC for domain '%s'" %
domain)



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