DIAGNOSING YOUR SAMBA SERVER
This file contains a list of tests you can perform to validate your Samba server. It also tells you what the likely cause of the problem is if it fails any one of these steps. If it passes all these tests then it is probably working fine.
You
should do ALL the tests, in the order shown. I have tried to carefully
choose them so later tests only use capabilities verified in the earlier
tests.
ASSUMPTIONS
In all of the tests let's assume you have a Samba server called BIGSERVER and a PC called ACLIENT both in workgroup TESTGROUP. Let's also assume the PC is running windows for workgroups with a recent copy of the microsoft tcp/ip stack. Alternatively, your PC may be running Windows 95 or Windows NT (Workstation or Server).
The procedure is similar for other types of clients.
Let's
also assume you know the name of an available share in your smb.conf. I
will assume this share is called "tmp". You can add a "tmp" share like
by adding the following to smb.conf:
[tmp]comment = temporary files
path = /tmp
read only = yes
THESE
TESTS ASSUME VERSION 2.0.6 OR LATER OF THE SAMBA SUITE. SOME COMMANDS SHOWN
DID NOT EXIST IN EARLIER VERSIONS
Please pay attention to the error messages you receive. If any error message reports that your server is being unfriendly you should first check that you IP name resolution is correctly set up. eg: Make sure your /etc/resolv.conf file points to name servers that really do exist.
Also,
if you do not have DNS server access for name resolution please check that
the settings for your smb.conf file results in "dns proxy = no". The best
way to check this is with "testparm smb.conf"
In
the directory in which you store your smb.conf file, run the command "testparm
smb.conf". If it reports any errors then your smb.conf configuration file
is faulty.
Note: Your smb.conf file may be located in: /etc
Or in: /usr/local/samba/lib
run the command "ping BIGSERVER" from the PC and "ping ACLIENT" from the unix box. If you don't get a valid response then your TCP/IP software is not correctly installed.
Note that you will need to start a "dos prompt" window on the PC to run ping.
Another
reason why ping might fail is if your host is running firewall software.
You will need to relax the rules to let in the workstation in question,
perhaps by allowing access from another subnet (on Linux this is done via
the ipfwadm program.)
TEST 3:
Run the command "smbclient -L BIGSERVER" on the unix box. You should get a list of available shares back.
If you get a error message containing the string "Bad password" then you probably have either an incorrect "hosts allow", "hosts deny" or "valid users" line in your smb.conf, or your guest account is not valid. Check what your guest account is using "testparm" and temporarily remove any "hosts allow", "hosts deny", "valid users" or "invalid users" lines.
If you get a "connection refused" response then the smbd server may not be running. If you installed it in inetd.conf then you probably edited that file incorrectly. If you installed it as a daemon then check that it is running, and check that the netbios-ssn port is in a LISTEN state using "netstat -a".
If you get a "session request failed" then the server refused the connection. If it says "Your server software is being unfriendly" then its probably because you have invalid command line parameters to smbd, or a similar fatal problem with the initial startup of smbd. Also check your config file (smb.conf) for syntax errors with "testparm" and that the various directories where samba keeps its log and lock files exist.
There
are a number of reasons for which smbd may refuse or decline a session
request. The most common of these involve one or more of the following
smb.conf file entries:
hosts allow = xxx.xxx.xxx.xxx/yy
bind interfaces only = Yes
hosts deny = ALLhosts allow = xxx.xxx.xxx.xxx/yy 127.
Another common cause of these two errors is having something already running on port 139, such as Samba (ie: smbd is running from inetd already) or something like Digital's Pathworks. Check your inetd.conf file before trying to start smbd as a daemon, it can avoid a lot of frustration!
And
yet another possible cause for failure of TEST 3 is when the subnet mask
and / or broadcast address settings are incorrect. Please check that the
network interface IP Address / Broadcast Address / Subnet Mask settings
are correct and that Samba has correctly noted these in the log.nmb file.
TEST 4:
Run the command "nmblookup -B BIGSERVER __SAMBA__". You should get the IP address of your Samba server back.
If you don't then nmbd is incorrectly installed. Check your inetd.conf if you run it from there, or that the daemon is running and listening to udp port 137.
One
common problem is that many inetd implementations can't take many parameters
on the command line. If this is the case then create a one-line script
that contains the right parameters and run that from inetd.
TEST
5:
run the command "nmblookup -B ACLIENT '*'"
You should get the PCs IP address back. If you don't then the client software on the PC isn't installed correctly, or isn't started, or you got the name of the PC wrong.
If
ACLIENT doesn't resolve via DNS then use the IP address of the client in
the above test.
TEST 6:
Run the command "nmblookup -d 2 '*'"
If this doesn't give a similar result to the previous test then nmblookup isn't correctly getting your broadcast address through its automatic mechanism. In this case you should experiment use the "interfaces" option in smb.conf to manually configure your IP address, broadcast and netmask.
If your PC and server aren't on the same subnet then you will need to use the -B option to set the broadcast address to the that of the PCs subnet.
This test will probably fail if your subnet mask and broadcast address are not correct. (Refer to TEST 3 notes above).
Run
the command "smbclient //BIGSERVER/TMP". You should then be prompted for
a password. You should use the password of the account you are logged into
the unix box with. If you want to test with another account then add the
-U option to the end of the command line.
Note: It is possible to specify the password along with the username as follows:smbclient //bigserver/tmp -Ujohndoe%secret
If it says "bad password" then the likely causes are:
- you have shadow passords (or some other password system) but didn't compile in support for them in smbd- your "valid users" configuration is incorrect
- you have a mixed case password and you haven't enabled the "password level" option at a high enough level
- the "path =" line in smb.conf is incorrect. Check it with testparm
- you enabled password encryption but didn't create the SMB encrypted password file
- The uid for the user in smbpasswd is different from that in /etc/passwd.
Once
connected you should be able to use the commands "dir"
"get" "put" etc. Type "help
" for instructions. You should especially
check that the amount of free disk space shown is correct when you type
"dir".
TEST
8:
On the PC type the command "net view \\BIGSERVER". You will need to do this from within a "dos prompt" window. You should get back a list of available shares on the server.
If
you get a "network name not found" or similar error then netbios name resolution
is not working. This is usually caused by a problem in nmbd. To overcome
it you could do one of the following (you only need to choose one of them):
- add the IP address of BIGSERVER to the "wins server" box in the advanced tcp/ip setup on the PC.
- enable windows name resolution via DNS in the advanced section of the tcp/ip setup
- add BIGSERVER to your lmhosts file on the PC.
Also, do not overlook that fact that when the workstation requests the connection to the samba server it will attempt to connect using the name with which you logged onto your Windows machine. You need to make sure that an account exists on your Samba server with that exact same name and password.
If
you get "specified computer is not receiving requests" or similar it probably
means that the host is not contactable via tcp services. Check to see if
the host is running tcp wrappers, and if so add an entry in the hosts.allow
file for your client (or subnet, etc.)
TEST
9:
Run the command "net use x: \\BIGSERVER\TMP". You should be prompted for a password then you should get a "command completed successfully" message. If not then your PC software is incorrectly installed or your smb.conf is incorrect. make sure your "hosts allow" and other config lines in smb.conf are correct.
It's
also possible that the server can't work out what user name to connect
you as. To see if this is the problem add the line "user
= USERNAME" to the [tmp] section of smb.conf
where "USERNAME" is the username corresponding to the password you typed.
If you find this fixes things you may need the username mapping option.
TEST 10:
Run the command "nmblookup -M TESTGROUP" where TESTGROUP is the name of the workgroup that your Samba server and Windows PCs belong to. You should get back the IP address of the master browser for that workgroup.
If
you don't then the election process has failed. Wait a minute to see if
it is just being slow then try again. If it still fails after that then
look at the browsing options you have set in smb.conf.
Make sure you have "preferred master = yes"
to ensure that an election is held at startup.
From
file manager try to browse the server. Your samba server should appear
in the browse list of your local workgroup (or the one you specified in
smb.conf). You should be able to double click on the name of the server
and get a list of shares. If you get a "invalid
password" error when you do then you are probably
running WinNT and it is refusing to browse a server that has no encrypted
password capability and is in user level security mode. In this case either
set "security = server"
AND "password server = Windows_NT_Machine"
in your smb.conf
file, or enable encrypted passwords AFTER compiling in support for encrypted
passwords (refer to the Makefile).