[Samba] NT_STATUS_OBJECT_NAME_NOT_FOUND when print client tries to write to \epmapper named pipe - Samba

This is a discussion on [Samba] NT_STATUS_OBJECT_NAME_NOT_FOUND when print client tries to write to \epmapper named pipe - Samba ; Hello all, I've googled this but couldn't find anything relevant and the list's archives didn't turn anything either, so pretty please someone take a look at this if you can spare a moment. My Samba server shares its CUPS printer, ...

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Thread: [Samba] NT_STATUS_OBJECT_NAME_NOT_FOUND when print client tries to write to \epmapper named pipe

  1. [Samba] NT_STATUS_OBJECT_NAME_NOT_FOUND when print client tries to write to \epmapper named pipe

    Hello all,

    I've googled this but couldn't find anything relevant and the list's
    archives didn't turn anything either, so pretty please someone take a
    look at this if you can spare a moment.

    My Samba server shares its CUPS printer, but Windows clients cannot
    print to it (I haven't tried other CIFS clients). I have the
    point-n-print driver all set up, so the Windows XP Pro clients can
    automatically detect this printer and load the driver (I'm also able to
    set the server default settings so the devmode is OK). But once the
    printer is set up in the Windows client, the test page doesn't print.
    The Windows driver says there's a communication problem with the
    printer, and looking at logfiles and traffic captures I see the problem
    is that the client is trying to do an NTCreate_and_X operation to open a
    named pipe called "\epmapper" but Samba answers with an
    NT_STATUS_OBJECT_NAME_NOT_FOUND message. The client retries this
    operation a couple of times and then gives up.

    I'm testing this by connecting to the server from a non-domain-member
    machine, but by manually setting the correct username and password with
    the "net use \\myserver /user:muserver\myprinteradminusername itspass"
    command on a Windows command-line. The client and the server are both on
    the same Workgroup.
    In case you're wondering, my /var/spool/samba directory exists and has
    mode 1777.

    Here's a level 10 log (only the interesting part; ask if you need all of
    it):
    -----------------------
    [2008/04/29 02:30:04, 10] lib/util.c:dump_data(2264)
    [000] 00 5C 00 65 00 70 00 6D 00 61 00 70 00 70 00 65 .\.e.p.m .a.p.p.e
    [010] 00 72 00 00 00 .r...
    [2008/04/29 02:30:04, 3] smbd/process.c:switch_message(926)
    switch message SMBntcreateX (pid 16016) conn 0x555555c09660
    [2008/04/29 02:30:04, 4] smbd/uid.c:change_to_user(183)
    change_to_user: Skipping user change - already user
    [2008/04/29 02:30:04, 10] smbd/nttrans.c:reply_ntcreate_and_X(515)
    reply_ntcreate_and_X: flags = 0x16, access_mask = 0x2019f
    file_attributes = 0x0, share_access = 0x3, create_disposition = 0x1
    create_options = 0x40 root_dir_fid = 0x0
    [2008/04/29 02:30:04, 4] smbd/nttrans.c:nt_open_pipe(328)
    nt_open_pipe: Opening pipe \epmapper.
    [2008/04/29 02:30:04, 3] smbd/error.c:error_packet_set(106)
    error packet at smbd/nttrans.c(343) cmd=162 (SMBntcreateX)
    NT_STATUS_OBJECT_NAME_NOT_FOUND
    -----------------------

    Here's an strace of smbd (also abridged); notice that the real uid 501
    corresponds to the one chosen by the "net use" command:

    -----------------------
    write(20, "[2008/04/29 02:35:56, 10] lib/util.c:dump_data(2264)\n", 53) = 53
    geteuid() = 501
    write(20, " [000] 00 5C 00 65 00 70 00 6D 00 61 00 70 00 70 00 65
    ..\\.e.p.m .a.p.p.e\n", 76) = 76
    geteuid() = 501
    write(20, " [010] 00 72 00 00 00
    ..r... \n", 65) = 65
    stat("/etc/localtime", {st_mode=S_IFREG|0664, st_size=1882, ...}) = 0
    geteuid() = 501
    write(20, "[2008/04/29 02:35:56, 3]
    smbd/process.c:switch_message(926)\n", 60) = 60
    geteuid() = 501
    write(20, " switch message SMBntcreateX (pid 17224) conn
    0x555555c094d0\n", 62) = 62
    stat("/etc/localtime", {st_mode=S_IFREG|0664, st_size=1882, ...}) = 0
    geteuid() = 501
    write(20, "[2008/04/29 02:35:56, 4] smbd/uid.c:change_to_user(183)\n",
    56) = 56
    geteuid() = 501
    write(20, " change_to_user: Skipping user change - already user\n", 54)
    = 54
    stat("/etc/localtime", {st_mode=S_IFREG|0664, st_size=1882, ...}) = 0
    geteuid() = 501
    write(20, "[2008/04/29 02:35:56, 10]
    smbd/nttrans.c:reply_ntcreate_and_X(515)\n", 67) = 67
    geteuid() = 501
    write(20, " reply_ntcreate_and_X: flags = 0x16, access_mask = 0x2019f
    file_attributes = 0x0, share_access = 0x3, create_dispositio"..., 169) = 169
    stat("/etc/localtime", {st_mode=S_IFREG|0664, st_size=1882, ...}) = 0
    geteuid() = 501
    write(20, "[2008/04/29 02:35:56, 4] smbd/nttrans.c:nt_open_pipe(328)\n",
    58) = 58
    geteuid() = 501
    write(20, " nt_open_pipe: Opening pipe \\epmapper.\n", 40) = 40
    stat("/etc/localtime", {st_mode=S_IFREG|0664, st_size=1882, ...}) = 0
    geteuid() = 501
    write(20, "[2008/04/29 02:35:56, 3]
    smbd/error.c:error_packet_set(106)\n", 60) = 60
    geteuid() = 501
    write(20, " error packet at smbd/nttrans.c(343) cmd=162 (SMBntcreateX)
    NT_STATUS_OBJECT_NAME_NOT_FOUND\n", 93) = 93
    -----------------------

    Here's my smb.conf:
    -----------------------
    [global]
    workgroup = CASITA
    netbios name = RAINBOW
    server string = Samba Server
    security = USER
    encrypt passwords = Yes
    passdb backend = tdbsam
    domain master = Yes
    local master = Yes
    preferred master = Yes
    os level = 35
    guest account = sambaguest
    map to guest = Bad User
    socket options = TCP_NODELAY IPTOS_LOWDELAY SO_KEEPALIVE
    SO_RCVBUF=8192 SO_SNDBUF=8192
    dns proxy = No
    wins support = Yes
    name resolve order = wins lmhosts host bcast
    pid directory = /var/run/samba
    lock directory = /var/cache/samba
    max smbd processes = 30
    domain logons = Yes
    logon script = scripts\login.bat OR scripts\%U.bat
    logon path = \\%L\Profiles\%U
    logon drive = H:
    logon home = \\%L\%U\.9xprofile
    time server = Yes
    idmap uid = 15000-20000
    idmap gid = 15000-20000
    printing = cups
    load printers = No
    printcap name = cups
    cups options = "raw"
    log level = 10
    log file = /var/log/samba/log.%m
    max log size = 10000
    hosts allow = 192.168.1.0/24 127.0.0.0/8
    hosts deny = ALL
    unix password sync = No
    nt acl support = Yes

    [printers]
    comment = All Printers
    printable = Yes
    path = /var/spool/samba
    browseable = No
    read only = Yes
    guest ok = No
    printer admin = root,@ntadmins
    valid users = @ntadmins, root

    [LEXX1270]
    comment = "Lexmark X1270"
    path = /var/spool/samba
    printable = Yes
    browseable = Yes
    read only = Yes
    guest ok = No
    valid users = @ntadmins,root


    [print$]
    comment = Point-n-Print Driver Download Area
    path = /opt/samba/shares/printdrivers
    browseable = No
    read only = Yes
    guest ok = No
    write list = @ntadmins, root
    valid users = @ntadmins, root
    -----------------------

    Please share some insight about what's going on here, because I'm stumped.

    Thanks,

    L.
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  2. Re: [Samba] NT_STATUS_OBJECT_NAME_NOT_FOUND when print client tries to write to \epmapper named pipe

    On Tue, Apr 29, 2008 at 04:01:39AM -0300, Leonardo Tancredi wrote:
    > printer, and looking at logfiles and traffic captures I see the problem
    > is that the client is trying to do an NTCreate_and_X operation to open a
    > named pipe called "\epmapper" but Samba answers with an
    > NT_STATUS_OBJECT_NAME_NOT_FOUND message. The client retries this
    > operation a couple of times and then gives up.


    This is the so-called endpoint mapper which right now is not
    supported by Samba 3. I'm working on that right now. In the
    meantime, it would be interesting to see a sniff of this
    machine printing using the same driver on a Windows box.

    Volker

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