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-   -   Why is my samba misbehaving? (http://www.linuxquestions.org/questions/linux-networking-3/why-is-my-samba-misbehaving-102729/)

sapphos 10-11-2003 05:38 AM

Why is my samba misbehaving?
 
I'm on RedHat 9, kernel is 2.4-20. The following text is cut-n-paste from my posts to Linux4All in Delphi Forums, so it's going to look a little choppy, but it tells you everything I currently know about my problem:

Okay, this is weird. I had samba up and running last week, before my partner and I went to her mom's for the weekend. I come home and - nada. I can't even click on the red hat and then "Network Servers" because I get the error:

Couldn't display "smb:///", because Nautilus cannot contact the SMB master browser.
Check that an SMB server is running in the local network.

I went to /var/log/samba and looked at both log.smbd and log.nmbd; both seem to say that samba is up and happy. There is a log.winbindd file that is complaining:

[root@tara samba]# cat log.winbindd
[2003/09/27 16:49:10, 0] libsmb/nmblib.c:send_udp(756)
Packet send failed to 192.168.1.255(137) ERRNO=Network is unreachable
[2003/09/27 16:49:11, 0] libsmb/nmblib.c:send_udp(756)
Packet send failed to 192.168.1.255(137) ERRNO=Network is unreachable
[2003/09/28 17:06:32, 0] libsmb/nmblib.c:send_udp(756)
Packet send failed to 192.168.1.255(137) ERRNO=Network is unreachable
[2003/09/28 17:06:32, 0] libsmb/nmblib.c:send_udp(756)
Packet send failed to 192.168.1.255(137) ERRNO=Network is unreachable
[2003/10/02 19:48:15, 0] libsmb/nmblib.c:send_udp(756)
Packet send failed to 192.168.1.255(137) ERRNO=Network is unreachable
[2003/10/02 19:48:15, 0] libsmb/nmblib.c:send_udp(756)
Packet send failed to 192.168.1.255(137) ERRNO=Network is unreachable

But as you can see, these are from Oct 2. Okay, so what gives?

Oh - when I go into Services, smb and nmb both show running. I also see winbind running. I also have NFS running, as it seems that without that, my Win98 PC can't see my Linux box.

~~~~~~~~~~~~~~~~~

Well, like the old Windaz person I am, I even went so far as to reboot twice, once even physically turning everything off, waiting a minute, and turning back on.

The weird thing is that the services all say they're running and fat and happy. Maybe I *do* need to reboot the router and cable modem.

~~~~~~~~~~~~~~~~~

Yes, I rebooted everything: shut down the PCs, the router, and the cable modem. Went and did something else for several minutes, then came back. Powered the router up. Powered the cable modem up. Powered the PCs.

The Windows box is fine; Network Neighborhood shows that box. Went to the Linux box, and it sees the Windows box. And, for just a fleeting moment, it saw itself, too. Then it "broke" and can't see anything.

~~~~~~~~~~~~~~~~~

Here's a clue about my problem. I got this via the logwatch mail on root today:

--------------------- samba Begin ------------------------

**Unmatched Entries**
libsmb/nmblib.c:send_udp(756) Packet send failed to 192.168.1.255(137) ERRNO=Network is unreachable : 2 Time(s)
smbd/oplock_linux.c:linux_init_kernel_oplocks(287) Failed to setup RT_SIGNAL_LEASE handler : 7 Time(s)

---------------------- samba End -------------------------

~~~~~~~~~~~~~~~~~

That's my story so far. Can you guys help me? Please?

Thanks in advance!
Becca

david_ross 10-11-2003 06:48 AM

Welcome to LQ.

Can you post smb.conf and the output of:
iptables -L
route -n

sapphos 10-11-2003 02:17 PM

My smb.conf file:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# 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 (perhaps too
# many!) most of which are not shown in this example
#
# Any line which starts with a ; (semi-colon) or a # (hash)
# is a comment and is ignored. In this example we will use a #
# for commentry and a ; for parts of the config file that you
# may wish to enable
#
# NOTE: Whenever you modify this file you should run the command "testparm"
# to check that you have not made any basic syntactic errors.
#
#======================= Global Settings =====================================
[global]

# workgroup = NT-Domain-Name or Workgroup-Name
workgroup = teena

# server string is the equivalent of the NT Description field
server string = samba server

# This option is important for security. It allows you to restrict
# connections to machines which are on your local network. The
# following example restricts access to two C class networks and
# the "loopback" interface. For more examples of the syntax see
# the smb.conf man page
; hosts allow = 192.168.1. 192.168.2. 127.


# if you want to automatically load your printer list rather
# than setting them up individually then you'll need this
printcap name = /etc/printcap
load printers = yes

# It should not be necessary to spell out the print system type unless
# yours is non-standard. Currently supported print systems include:
# bsd, sysv, plp, lprng, aix, hpux, qnx, cups
printing = cups

# Uncomment this if you want a guest account, you must add this to /etc/passwd
# otherwise the user "nobody" is used
; guest account = pcguest

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

# Put a capping on the size of the log files (in Kb).
max log size = 0

# Security mode. Most people will want user level security. See
# security_level.txt for details.

# Use password server option only with security = server
# The argument list may include:
# password server = My_PDC_Name [My_BDC_Name] [My_Next_BDC_Name]
# or to auto-locate the domain controller/s
# password server = *
; password server = <NT-Server-Name>

# Password Level allows matching of _n_ characters of the password for
# all combinations of upper and lower case.
; password level = 8
; username level = 8

# You may wish to use password encryption. Please read
# ENCRYPTION.txt, Win95.txt and WinNT.txt in the Samba documentation.
# Do not enable this option unless you have read those documents
encrypt passwords = yes
smb passwd file = /etc/samba/smbpasswd

# The following is needed to keep smbclient from spouting spurious errors
# when Samba is built with support for SSL.
; ssl CA certFile = /usr/share/ssl/certs/ca-bundle.crt

# The following are needed to allow password changing from Windows to
# update the Linux system password also.
# NOTE: Use these with 'encrypt passwords' and 'smb passwd file' above.
# NOTE2: You do NOT need these to allow workstations to change only
# the encrypted SMB passwords. They allow the Unix password
# to be kept in sync with the SMB password.
unix password sync = Yes
passwd program = /usr/bin/passwd %u
passwd chat = *New*password* %n\n *Retype*new*password* %n\n *passwd:*all*authentication*tokens*updated*successfully*

# You can use PAM's password change control flag for Samba. If
# enabled, then PAM will be used for password changes when requested
# by an SMB client instead of the program listed in passwd program.
# It should be possible to enable this without changing your passwd
# chat parameter for most setups.

pam password change = yes

# Unix users can map to different SMB User names
; username map = /etc/samba/smbusers

# 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 = /etc/samba/smb.conf.%m

# This parameter will control whether or not Samba should obey PAM's
# account and session management directives. The default behavior is
# to use PAM for clear text authentication only and to ignore any
# account or session management. Note that Samba always ignores PAM
# for authentication in the case of encrypt passwords = yes

obey pam restrictions = yes

# Most people will find that this option gives better performance.
# See speed.txt and the manual pages for details
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

# Configure Samba to use multiple interfaces
# If you have multiple network interfaces then you must list them
# here. See the man page for details.
; interfaces = 192.168.12.2/24 192.168.13.2/24

# Configure remote browse list synchronisation here
# request announcement to, or browse list sync from:
# a specific host or from / to a whole subnet (see below)
; remote browse sync = 192.168.3.25 192.168.5.255
# Cause this host to announce itself to local subnets here
# remote announce = 192.168.1.255 192.168.2.44

# Browser Control Options:
# set local master to no if you don't want Samba to become a master
# browser on your network. Otherwise the normal election rules apply
; local master = yes

# OS Level determines the precedence of this server in master browser
# elections. The default value should be reasonable
; os level = 33

# Domain Master specifies Samba to be the Domain Master Browser. This
# allows Samba to collate browse lists between subnets. Don't use this
# if you already have a Windows NT domain controller doing this job
; domain master = yes

# Preferred Master causes Samba to force a local browser election on startup
# and gives it a slightly higher chance of winning the election
; preferred master = yes

# Enable this if you want Samba to be a domain logon server for
# Windows95 workstations.
; domain logons = yes

# if you enable domain logons then you may want a per-machine or
# per user logon script
# run a specific logon batch file per workstation (machine)
; logon script = %m.bat
# run a specific logon batch file per username
; logon script = %U.bat

# Where to store roving profiles (only for Win95 and WinNT)
# %L substitutes for this servers netbios name, %U is username
# You must uncomment the [Profiles] share below
; logon path = \\%L\Profiles\%U

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable it's WINS Server
; wins support = yes

# 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

# WINS Proxy - Tells Samba to answer name resolution queries on
# behalf of a non WINS capable client, for this to work there must be
# at least one WINS Server on the network. The default is NO.
; wins proxy = yes

# DNS Proxy - tells Samba whether or not to try to resolve NetBIOS names
# via DNS nslookups. The built-in default for versions 1.9.17 is yes,
# this has been changed in version 1.9.18 to no.
username map = /etc/samba/smbusers
dns proxy = no

# Case Preservation can be handy - system default is _no_
# NOTE: These can be set on a per share basis
; preserve case = no
; short preserve case = no
# Default case is normally upper case for all DOS files
; default case = lower
# Be very careful with case sensitivity - it can break things!
; case sensitive = no

#============================ Share Definitions ==============================
[homes]
comment = Home Directories
browseable = no
writeable = yes
valid users = %S
create mode = 0664
directory mode = 0775
# If you want users samba doesn't recognize to be mapped to a guest user
; map to guest = bad user


# Un-comment the following and create the netlogon directory for Domain Logons
; [netlogon]
; comment = Network Logon Service
; path = /usr/local/samba/lib/netlogon
; guest ok = yes
; writable = no
; share modes = no


# Un-comment the following to provide a specific roving profile share
# the default is to use the user's home directory
;[Profiles]
; path = /usr/local/samba/profiles
; browseable = no
; guest ok = yes


# NOTE: If you have a BSD-style print system there is no need to
# specifically define each individual printer
[printers]
comment = All Printers
path = /var/spool/samba
browseable = no
# Set public = yes to allow user 'guest account' to print
printable = yes

# This one is useful for people to share files
;[tmp]
; comment = Temporary file space
; path = /tmp
; read only = no
; public = yes

# A publicly accessible directory, but read only, except for people in
# the "staff" group
;[public]
; comment = Public Stuff
; path = /home/samba
; public = yes
; writable = yes
; printable = no
; write list = @staff

# Other examples.
#
# A private printer, usable only by fred. Spool data will be placed in fred's
# home directory. Note that fred must have write access to the spool directory,
# wherever it is.
;[fredsprn]
; comment = Fred's Printer
; valid users = fred
; path = /home/fred
; printer = freds_printer
; public = no
; writable = no
; printable = yes

# A private directory, usable only by fred. Note that fred requires write
# access to the directory.
;[fredsdir]
; comment = Fred's Service
; path = /usr/somewhere/private
; valid users = fred
; public = no
; writable = yes
; printable = no

# a service which has a different directory for each machine that connects
# this allows you to tailor configurations to incoming machines. You could
# also use the %U option to tailor it by user name.
# The %m gets replaced with the machine name that is connecting.
;[pchome]
; comment = PC Directories
; path = /usr/local/pc/%m
; public = no
; writable = yes

# A publicly accessible directory, read/write to all users. Note that all files
# created in the directory by users will be owned by the default user, so
# any user with access can delete any other user's files. Obviously this
# directory must be writable by the default user. Another user could of course
# be specified, in which case all files would be owned by that user instead.
;[public]
; path = /usr/somewhere/else/public
; public = yes
; only guest = yes
; writable = yes
; printable = no

# The following two entries demonstrate how to share a directory so that two
# users can place files there that will be owned by the specific users. In this
# setup, the directory should be writable by both users and should have the
# sticky bit set on it to prevent abuse. Obviously this could be extended to
# as many users as required.
;[myshare]
; comment = Mary's and Fred's stuff
; path = /usr/somewhere/shared
; valid users = mary fred
; public = no
; writable = yes
; printable = no
; create mask = 0765


[archive-ms-1]
comment = ms_archive
path = /mnt/scsi2/archive-ms
writeable = yes

[archive]
comment = linux_archive
path = /mnt/scsi2/archive
writeable = yes

[vampmn]
comment = Margaret
path = /home/vampmn
writeable = yes
valid users = vampmn

[sapphos]
comment = Becca
path = /home/sapphos
writeable = yes
valid users = sapphos

[music]
comment = music
path = /home/music
writeable = yes

[pics]
comment = pictures
path = /home/pics
writeable = yes

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[root@tara samba]# iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
RH-Lokkit-0-50-INPUT all -- anywhere anywhere

Chain FORWARD (policy ACCEPT)
target prot opt source destination
RH-Lokkit-0-50-INPUT all -- anywhere anywhere

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

Chain RH-Lokkit-0-50-INPUT (2 references)
target prot opt source destination
ACCEPT udp -- ntp-1.gw.uiuc.edu anywhere udp spt:ntp dpt:ntp
ACCEPT udp -- ntp-0.gw.uiuc.edu anywhere udp spt:ntp dpt:ntp
ACCEPT udp -- ntp1.jrc.us anywhere udp spt:ntp dpt:ntp
ACCEPT udp -- ntp2.jrc.us anywhere udp spt:ntp dpt:ntp
ACCEPT udp -- ns3.oit.unc.edu anywhere udp spt:ntp dpt:ntp
ACCEPT udp -- dev.tummy.com anywhere udp spt:ntp dpt:ntp
ACCEPT udp -- 63.247.194.250 anywhere udp spt:ntp dpt:ntp
ACCEPT udp -- 192.168.1.1 anywhere udp spt:domain dpts:1025:65535
ACCEPT tcp -- anywhere anywhere tcp dpt:telnet flags:SYN,RST,ACK/SYN
ACCEPT udp -- anywhere anywhere udp spts:bootps:bootpc dpts:bootps:bootpc
ACCEPT udp -- anywhere anywhere udp spts:bootps:bootpc dpts:bootps:bootpc
ACCEPT all -- anywhere anywhere
REJECT tcp -- anywhere anywhere tcp dpts:0:1023 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable
REJECT tcp -- anywhere anywhere tcp dpt:nfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable
REJECT udp -- anywhere anywhere udp dpts:0:1023 reject-with icmp-port-unreachable
REJECT udp -- anywhere anywhere udp dpt:nfs reject-with icmp-port-unreachable
REJECT tcp -- anywhere anywhere tcp dpts:x11:6009 flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable
REJECT tcp -- anywhere anywhere tcp dpt:xfs flags:SYN,RST,ACK/SYN reject-with icmp-port-unreachable

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[root@tara samba]# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I have two PCs and the router/hub in my net. Their IPs are:
192.168.1.1 - Linksys router/hub
192.168.1.100 - Linux box (which I'm using to post this with)
192.168.1.101 - Win98 box (which AFAIK isn't having any issues)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thank you!

sapphos 10-11-2003 02:21 PM

Oh, I should have also said that I've had Linux running since late August. Mandrake was my first distro, and I moved to RH around the first of September. Up until *very* recently samba has been fine - at least, AFAIK. However - there was a line in the smb.conf file that made me pause; the one about SSL. RH just patched SSL to prevent intrusions... could this be my problem?

david_ross 10-11-2003 02:27 PM

It looks like you have firewall rules blocking requests to the smb ports. Try temporarily removing your firewall rules:
iptables -F

Restart samba:
service smb restart

Then try accessing it again.


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