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post #1 of 12 Old 05-19-2012, 05:22 PM - Thread Starter
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I have a very weird issue. I have isolated the issue to my linux mint server. This issue happens both with hard wired connection or when I use wireless-N. It happens on multiple clients using VLC, or XMBC.

When I play a 1080p movie in XMBC the network connection closes after a min or two and it brings me to the home screen. When I play it over the network in VLC I get an error message from VLC.

I have found a workaround to this problem. It involves me playing a movie from another computer on the network. When I do this both files are streamed perfectly.

I do not have this issue when playing 720p or lower res content.

My server is a old dell laptop running the laster ver of linux mint.

I did a ping test and have less than 1% packet loss. I have a feeling it has something to do with SAMBA.

I have hit a wall with my troubleshooting. What tools can I use to help me troubleshoot this?


Thanks!
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post #2 of 12 Old 05-20-2012, 06:51 AM
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We had a problem with Samba in Ubuntu 12.04 that wasn't exactly like yours, but similar, so maybe what fixed it for us will work. Try going to the “Misc” section of /etc/samba/smb.conf and set domain master = no

Then restart Samba: sudo service smbd restart

This may or may not fix the issue. The problem seems to be that Ubuntu (and perhaps Mint?) is just a bit too aggressive about wanting to be the "Master Browser" if left on the default setting. In our case it was causing remote shares to disappear on other computers on our network (neither the shares nor the computers where the shares disappeared were running Ubuntu, but after installing Ubuntu 12.04 on our HTPC box the problem appeared, and after trying the above fix it disappeared).

Of course you don't want to do this if you don't have any other computers on your network capable of acting as a master browser, but most people do. There may be a better approach, but since I'm not that familiar with the inner workings of Samba I do not know what it is.
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post #3 of 12 Old 05-20-2012, 10:25 AM - Thread Starter
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Thnaks, but no luck. I am getting a new gigabit/wireless-n router in the mail tomorrow. I am hoping a gigabit connection with DD-WRT will clear the issue up, probably not though. I'll post a copy of my smb.conf here in a few min.
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post #4 of 12 Old 05-20-2012, 10:40 AM - Thread Starter
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Here is my smb.conf

Code:
#
# Sample configuration file for the Samba suite for Debian GNU/Linux.
#
#
# This is the main Samba configuration file. You should read the
# smb.conf(5) manual page in order to understand the options listed
# here. Samba has a huge number of configurable options most of which 
# are not shown in this example
#
# Some options that are often worth tuning have been included as
# commented-out examples in this file.
#  - When such options are commented with ";", the proposed setting
#    differs from the default Samba behaviour
#  - When commented with "#", the proposed setting is the default
#    behaviour of Samba but the option is considered important
#    enough to be mentioned here
#
# NOTE: Whenever you modify this file you should run the command
# "testparm" to check that you have not made any basic syntactic 
# errors. 
# A well-established practice is to name the original file
# "smb.conf.master" and create the "real" config file with
# testparm -s smb.conf.master >smb.conf
# This minimizes the size of the really used smb.conf file
# which, according to the Samba Team, impacts performance
# However, use this with caution if your smb.conf file contains nested
# "include" statements. See Debian bug #483187 for a case
# where using a master file is not a good idea.
#

#======================= Global Settings =======================

[global]

usershare owner only = false
guest account = nobody



## Browsing/Identification ###

# Change this to the workgroup/NT-domain name your Samba server will part of
        workgroup = WORKGROUP

# server string is the equivalent of the NT Description field
        server string = %h server (Samba, LinuxMint)

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable its WINS Server
#   wins support = no

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
# Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
;   wins server = w.x.y.z

# This will prevent nmbd to search for NetBIOS names through DNS.
        dns proxy = no

# What naming service and in what order should we use to resolve host names
# to IP addresses
;   name resolve order = lmhosts host wins bcast

#### Networking ####

# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
;   interfaces = 127.0.0.0/8 eth0

# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself.  However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
;   bind interfaces only = yes



#### Debugging/Accounting ####

# This tells Samba to use a separate log file for each machine
# that connects
        log file = /var/log/samba/log.%m

# Cap the size of the individual log files (in KiB).
        max log size = 1000

# If you want Samba to only log through syslog then set the following
# parameter to 'yes'.
#   syslog only = no

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
        syslog = 0

# Do something sensible when Samba crashes: mail the admin a backtrace
        panic action = /usr/share/samba/panic-action %d


####### Authentication #######

# "security = user" is always a good idea. This will require a Unix account
# in this server for every user accessing the server. See
# /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/ServerType.html
# in the samba-doc package for details.
#   security = user

# You may wish to use password encryption.  See the section on
# 'encrypt passwords' in the smb.conf(5) manpage before enabling.
        encrypt passwords = true

# If you are using encrypted passwords, Samba will need to know what
# password database type you are using.  
;       passdb backend = tdbsam

        obey pam restrictions = yes

# This boolean parameter controls whether Samba attempts to sync the Unix
# password with the SMB password when the encrypted SMB password in the
# passdb is changed.
        unix password sync = yes

# For Unix password sync to work on a Debian GNU/Linux system, the following
# parameters must be set (thanks to Ian Kahan <<kahan@informatik.tu-muenchen.de> for
# sending the correct chat script for the passwd program in Debian Sarge).
        passwd program = /usr/bin/passwd %u
        passwd chat = *Enter\\snew\\s*\\spassword:* %n\
 *Retype\\snew\\s*\\spassword:* %n\
 *password\\supdated\\ssuccessfully* .

# This boolean controls whether PAM will be used for password changes
# when requested by an SMB client instead of the program listed in
# 'passwd program'. The default is 'no'.
        pam password change = yes

# This option controls how unsuccessful authentication attempts are mapped
# to anonymous connections
        map to guest = bad user

########## Domains ###########

# Is this machine able to authenticate users. Both PDC and BDC
# must have this setting enabled. If you are the BDC you must
# change the 'domain master' setting to no
#
;   domain logons = yes
#
# The following setting only takes effect if 'domain logons' is set
# It specifies the location of the user's profile directory
# from the client point of view)
# The following required a [profiles] share to be setup on the
# samba server (see below)
;   logon path = \\\\%N\\profiles\\%U
# Another common choice is storing the profile in the user's home directory
# (this is Samba's default)
#   logon path = \\\\%N\\%U\\profile

# The following setting only takes effect if 'domain logons' is set
# It specifies the location of a user's home directory (from the client
# point of view)
;   logon drive = H:
#   logon home = \\\\%N\\%U

# The following setting only takes effect if 'domain logons' is set
# It specifies the script to run during logon. The script must be stored
# in the [netlogon] share
# NOTE: Must be store in 'DOS' file format convention
;   logon script = logon.cmd

# This allows Unix users to be created on the domain controller via the SAMR
# RPC pipe.  The example command creates a user account with a disabled Unix
# password; please adapt to your needs
; add user script = /usr/sbin/adduser --quiet --disabled-password --gecos "" %u

# This allows machine accounts to be created on the domain controller via the 
# SAMR RPC pipe.  
# The following assumes a "machines" group exists on the system
; add machine script  = /usr/sbin/useradd -g machines -c "%u machine account" -d /var/lib/samba -s /bin/false %u

# This allows Unix groups to be created on the domain controller via the SAMR
# RPC pipe.  
; add group script = /usr/sbin/addgroup --force-badname %g

########## Printing ##########

# If you want to automatically load your printer list rather
# than setting them up individually then you'll need this
#   load printers = yes

# lpr(ng) printing. You may wish to override the location of the
# printcap file
;   printing = bsd
;   printcap name = /etc/printcap

# CUPS printing.  See also the cupsaddsmb(8) manpage in the
# cupsys-client package.
;       printing = cups
;   printcap name = cups

############ Misc ############

# Using the following line enables you to customise your configuration
# on a per machine basis. The %m gets replaced with the netbios name
# of the machine that is connecting
;   include = /home/samba/etc/smb.conf.%m

# Most people will find that this option gives better performance.
# See smb.conf(5) and /usr/share/doc/samba-doc/htmldocs/Samba3-HOWTO/speed.html
# for details
# You may want to add the following on a Linux system:
#         SO_RCVBUF=8192 SO_SNDBUF=8192
#   socket options = TCP_NODELAY

# The following parameter is useful only if you have the linpopup package
# installed. The samba maintainer and the linpopup maintainer are
# working to ease installation and configuration of linpopup and samba.
;   message command = /bin/sh -c '/usr/bin/linpopup "%f" "%m" %s; rm %s' &

# Domain Master specifies Samba to be the Domain Master Browser. If this
# machine will be configured as a BDC (a secondary logon server), you
# must set this to 'no'; otherwise, the default behavior is recommended.
domain master = no

# Some defaults for winbind (make sure you're not using the ranges
# for something else.)
;   idmap uid = 10000-20000
;   idmap gid = 10000-20000
;   template shell = /bin/bash

# The following was the default behaviour in sarge,
# but samba upstream reverted the default because it might induce
# performance issues in large organizations.
# See Debian bug #368251 for some of the consequences of *not*
# having this setting and smb.conf(5) for details.
;   winbind enum groups = yes
;   winbind enum users = yes

# Setup usershare options to enable non-root users to share folders
# with the net usershare command.

# Maximum number of usershare. 0 (default) means that usershare is disabled.
;       usershare max shares = 100

# Allow users who've been granted usershare privileges to create
# public shares, not just authenticated ones
        usershare allow guests = yes
        username map = /etc/samba/smbusers

#======================= Share Definitions =======================

# Un-comment the following (and tweak the other settings below to suit)
# to enable the default home directory shares. This will share each 
# user's home director as \\\\server\\username
;[homes]
;   comment = Home Directories
;   browseable = no

# By default, the home directories are exported read-only. Change the
# next parameter to 'no' if you want to be able to write to them.
;   read only = yes

# File creation mask is set to 0700 for security reasons. If you want to
# create files with group=rw permissions, set next parameter to 0775.
;   create mask = 0700

# Directory creation mask is set to 0700 for security reasons. If you want to
# create dirs. with group=rw permissions, set next parameter to 0775.
;   directory mask = 0700

# By default, \\\\server\\username shares can be connected to by anyone
# with access to the samba server. Un-comment the following parameter
# to make sure that only "username" can connect to \\\\server\\username
# The following parameter makes sure that only "username" can connect
#
# This might need tweaking when using external authentication schemes
;   valid users = %S

# Un-comment the following and create the netlogon directory for Domain Logons
# (you need to configure Samba to act as a domain controller too.)
;[netlogon]
;   comment = Network Logon Service
;   path = /home/samba/netlogon
;   guest ok = yes
;   read only = yes

# Un-comment the following and create the profiles directory to store
# users profiles (see the "logon path" option above)
# (you need to configure Samba to act as a domain controller too.)
# The path below should be writable by all users so that their
# profile directory may be created the first time they log on
;[profiles]
;   comment = Users profiles
;   path = /home/samba/profiles
;   guest ok = no
;   browseable = no
;   create mask = 0600
;   directory mask = 0700

[printers]
        comment = All Printers
        browseable = no
        path = /var/spool/samba
        printable = yes
;       guest ok = no
;       read only = yes
        create mask = 0700

# Windows clients look for this share name as a source of downloadable
# printer drivers
[print$]
        comment = Printer Drivers
        path = /var/lib/samba/printers
;       browseable = yes
;       read only = yes
;       guest ok = no
# Uncomment to allow remote administration of Windows print drivers.
# You may need to replace 'lpadmin' with the name of the group your
# admin users are members of.
# Please note that you also need to set appropriate Unix permissions
# to the drivers directory for these users to have write rights in it
;   write list = root, @lpadmin

# A sample share for sharing your CD-ROM with others.
;[cdrom]
;   comment = Samba server's CD-ROM
;   read only = yes
;   locking = no
;   path = /cdrom
;   guest ok = yes

# The next two parameters show how to auto-mount a CD-ROM when the
#       cdrom share is accesed. For this to work /etc/fstab must contain
#       an entry like this:
#
#       /dev/scd0   /cdrom  iso9660 defaults,noauto,ro,user   0 0
#
# The CD-ROM gets unmounted automatically after the connection to the
#
# If you don't want to use auto-mounting/unmounting make sure the CD
#       is mounted on /cdrom
#
;   preexec = /bin/mount /cdrom
;   postexec = /bin/umount /cdrom

[Media]
        comment = Media
        path = /home/Media
        writeable = yes
        browseable = yes
        guest ok = yes
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post #5 of 12 Old 05-20-2012, 10:46 AM - Thread Starter
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Here are the SAMBA log files when the incident happened.

smbd log:
Code:
  smbd version 3.5.11 started.
  Copyright Andrew Tridgell and the Samba Team 1992-2010
[2012/05/20 13:17:10.760978,  0] smbd/server.c:1187(main)
  standard input is not a socket, assuming -D option
[2012/05/20 13:19:12.813911,  1] smbd/server.c:267(remove_child_pid)
  Scheduled cleanup of brl and lock database after unclean shutdown
[2012/05/20 13:19:32.825501,  1] smbd/server.c:240(cleanup_timeout_fn)
  Cleaning up brl and lock database after unclean shutdown
[2012/05/20 13:20:11.074219,  1] smbd/server.c:282(remove_child_pid)
  Could not find child 16162 -- ignoring
[2012/05/20 13:20:14.266752,  1] smbd/server.c:267(remove_child_pid)
  Scheduled cleanup of brl and lock database after unclean shutdown
[2012/05/20 13:20:34.267435,  1] smbd/server.c:240(cleanup_timeout_fn)
  Cleaning up brl and lock database after unclean shutdown
[2012/05/20 13:30:11.559888,  1] smbd/server.c:282(remove_child_pid)
  Could not find child 16293 -- ignoring
[2012/05/20 13:33:11.674081,  1] smbd/server.c:282(remove_child_pid)
  Could not find child 16348 -- ignoring
[2012/05/20 13:33:24.132888,  1] smbd/server.c:267(remove_child_pid)
  Scheduled cleanup of brl and lock database after unclean shutdown
[2012/05/20 13:33:44.143238,  1] smbd/server.c:240(cleanup_timeout_fn)
  Cleaning up brl and lock database after unclean shutdown
livingroom pc log file
Code:
[2012/05/20 13:32:57.907666,  1] smbd/service.c:1070(make_connection_snum)
  livingroom-pc (192.168.0.15) connect to service Media initially as user nobody (uid=65534, gid=65534) (pid 16338)
[2012/05/20 13:33:33.754577,  1] smbd/service.c:1070(make_connection_snum)
  livingroom-pc (192.168.0.15) connect to service Media initially as user nobody (uid=65534, gid=65534) (pid 16352)
[2012/05/20 13:34:10.955419,  1] smbd/service.c:1251(close_cnum)
  livingroom-pc (192.168.0.15) closed connection to service Media
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post #6 of 12 Old 05-20-2012, 11:11 AM
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Are you using Samba because you have a mixed O/S environment? If you are all Linux you could give NFS a try.
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post #7 of 12 Old 05-20-2012, 11:14 AM - Thread Starter
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My clients are all mac or windows.
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post #8 of 12 Old 05-20-2012, 02:13 PM
 
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If you are streaming to a windows machine, there is a registry edit that may help. Also, are you running any kind of anti-virus or third party firewall software on the windows machine, and what manufacturer & version if so.
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post #9 of 12 Old 05-20-2012, 02:22 PM - Thread Starter
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I think I have it troubleshooted down the the SAMBA service. I am able to reproduce the error on different clients, 2 windows PCs and my wife's Macbook.

I have that new router on the way so I am going to see if going from a 100 to 1000 Mbit connection makes the issue go away. I also am going to make a short Ethernet test run with some new wire. Though I doubt these will solve the issue.

A purge and reinstall of SAMBA may be on its way. If that doesn't work it is time for me to convince the wife to let me build a real server
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post #10 of 12 Old 05-20-2012, 02:58 PM
 
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You can try the latest beta of Samba and see how that works. As for the router, doubt that it will make a difference. Samba is a weird critter, especially when it comes to media streaming.
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post #11 of 12 Old 05-22-2012, 04:48 AM
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In the past, I had problems when I set the max protocol level to SMB2 - If you have that set, try knocking it down to SMB1 or whatever it's called in the box. I will say that I am not seeing this problem with Ubuntu 12.04's packaged Samba but did on previous releases. You might also check your tcp offload settings and flow control settings with ethtool - some cards just totally suck when you enable certain features, especially the cheapo onboard Realteks and the like. Total junk.

-Trouble
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post #12 of 12 Old 05-24-2012, 07:03 PM
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There are several troubleshooting steps you can take to see if it really is Samba, or something else.

1. Try something other than Samba. Try FTP'ing the same movie file from the server to the client. If it still fails, or the transfer stalls intermittently, it's a networking issue other than Samba.
2. Try just a straight up file copy over a Samba share. "cp" from Linux, "copy" from Windows, etc. See if a file copy over Samba works. If that fails, but the FTP test succeeds, then it's most certainly a Samba problem.

Hope this helps!
-- Kevin
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