[Samba] What does "NT_STATUS_PIPE_BROKEN" in log files mean ?

[Sekigawa Ai]

Hi All,

One day we upgraded client pc's OS from Windows7 to Windows10,
Windows10 clients could not access a samba server.

When we re-enabled the SMBv1 protocol on Windows10,  Windows10 clients
still could not access a samba server.

After adding the following [global] settings,  Windows10 clients could access
a samba server at last.
------------------------------------------------------------
min protocol = SMB2
max protocol = SMB2
------------------------------------------------------------

But Windows10 clients could not access a samba server via VPN.
Samba's log files show "smbd_smb2_request_incoming: client read error
NT_STATUS_PIPE_BROKEN" in many times.

What does "NT_STATUS_PIPE_BROKEN" in log files mean ?

See below for detail.
------------------------------------------------------------
[root at machine samba]# cat log.XXX.XXX.XXX.XXX
[2019/06/14 13:15:48.874851,  3] lib/access.c:338(allow_access)
  Allowed connection from XXX.XXX.XXX.XXX (XXX.XXX.XXX.XXX)
[2019/06/14 13:15:48.874963,  3] smbd/oplock.c:922(init_oplocks)
  init_oplocks: initializing messages.
[2019/06/14 13:15:48.875051,  3] smbd/oplock_linux.c:246(linux_init_kernel_oplocks)
  Linux kernel oplocks enabled
[2019/06/14 13:15:48.875133,  3] smbd/process.c:1609(process_smb)
  Transaction 0 of length 72 (0 toread)
[2019/06/14 13:15:48.885221,  2] smbd/reply.c:553(reply_special)
  netbios connect: name1=*SMBSERV0x0 name2=XXX-XXX     0x0
[2019/06/14 13:15:48.886409,  2] smbd/reply.c:573(reply_special)
  netbios connect: local=_smbserv remote=XXX-XXX, name type = 0
[2019/06/14 13:15:48.911383,  3] smbd/process.c:1609(process_smb)
  Transaction 0 of length 73 (0 toread)
[2019/06/14 13:15:48.911464,  3] smbd/process.c:1414(switch_message)
  switch message SMBnegprot (pid 4278) conn 0x0
[2019/06/14 13:15:48.926995,  3] smbd/negprot.c:598(reply_negprot)
  Requested protocol [NT LM 0.12]
[2019/06/14 13:15:48.927056,  3] smbd/negprot.c:598(reply_negprot)
  Requested protocol [SMB 2.002]
[2019/06/14 13:15:48.927077,  3] smbd/negprot.c:598(reply_negprot)
  Requested protocol [SMB 2.???]
[2019/06/14 13:15:48.927225,  3] smbd/negprot.c:704(reply_negprot)
  Selected protocol SMB 2.002
[2019/06/14 13:15:48.962421,  2] smbd/smb2_server.c:2631(smbd_smb2_request_incoming)
  smbd_smb2_request_incoming: client read error NT_STATUS_PIPE_BROKEN
[2019/06/14 13:15:48.962611,  3] smbd/server_exit.c:181(exit_server_common)
  Server exit (NT_STATUS_PIPE_BROKEN)
------------------------------------------------------------

If you have time, Please let me know.


Regards,
Ai Sekigawa


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