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[Samba] ERROR: failed to setup guest info




Hello,

I've been using samba for a few years but I use it only occasionally.
Today, I've found out that since the upgrade to 4.9.2, smbd wouldn't
start.

I use Arch Linux. The command that starts samba on the systemd service
is this:

	/usr/bin/smbd --foreground --no-process-group

These are my configuration file's [global] parameters:

	bind interfaces only = Yes
	domain master = No
	interfaces = enp0s25 lo
	local master = No
	log file = /var/log/samba/%m.log
	map to guest = Bad User
	max log size = 50
	passwd chat = *New*UNIX*password* %n\n *ReType*new*UNIX*password* %n\n *passwd:*all*authentication*tokens*updated*successfully*
	passwd program = /usr/bin/passwd %u
	preferred master = No
	security = USER
	server string = myserver
	unix password sync = Yes
	idmap config * : backend = tdb
	hosts allow = 192.168.14.

And these are the error messages from the journal:

	smbd[2339]: [2018/12/21 12:22:31.534503,  0] ../source3/auth/auth_util.c:1382(make_new_session_info_guest)
	smbd[2339]:   create_local_token failed: NT_STATUS_ACCESS_DENIED
	smbd[2339]: [2018/12/21 12:22:31.535964,  0] ../source3/smbd/server.c:2000(main)
	smbd[2339]:   ERROR: failed to setup guest info.

If I manual run `smbd --foreground --no-process-group --log-stdout -d2` I get the
following output:

	smbd version 4.9.4 started.
	Copyright Andrew Tridgell and the Samba Team 1992-2018
	uid=0 gid=0 euid=0 egid=0
	rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
	Registered MSG_REQ_POOL_USAGE
	Registered MSG_REQ_DMALLOC_MARK and LOG_CHANGED
	rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
	Processing section "[My share]"
	added interface enp0s25 ip=xxxx:xxxx:xxxx:x:xxxx:xxxx:xxxx:xxxx bcast= netmask=ffff:ffff:ffff:ffff::
	added interface enp0s25 ip=xxx.xxx.xx.xxx bcast=xxx.xxx.xx.xxx netmask=255.255.255.0
	added interface lo ip=::1 bcast= netmask=ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff
	added interface lo ip=127.0.0.1 bcast=127.255.255.255 netmask=255.0.0.0
	INFO: Profiling support unavailable in this build.
	No builtin backend found, trying to load plugin
	WARNING: Failed to create BUILTIN\Administrators group!  Can Winbind allocate gids?
	WARNING: Failed to create BUILTIN\Users group! Can Winbind allocate gids?
	Failed to create BUILTIN\Guests group NT_STATUS_ACCESS_DENIED!  Can Winbind allocate gids?
	create_local_token failed: NT_STATUS_ACCESS_DENIED
	ERROR: failed to setup guest info.

Any ideas? I can give more information if needed.

I've enabled nmb and winbindd systemd services which run the commands:

	/usr/bin/nmbd --foreground --no-process-group
	/usr/bin/winbindd --foreground --no-process-group

But these command don't fail.

Thanks.

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