[Samba] Intermittent failure of net ads join command with error "The transport connection is now disconnected"

L.P.H. van Belle belle at bazuin.nl
Wed Dec 13 09:13:52 UTC 2017


Hai, 
 
this is the "good" part of your config. 
 > >> [global]
> >> max log size = 0
> >> realm = DOMAIN.COM
> >> workgroup = DOMAIN
> >> security = ADS 
 
this is the bad part. 
> >> winbind enum users = yes
> >> winbind enum groups = yes
> >> idmap config * : backend = autorid
> >> idmap config * : range = 1000000-19999999
 
winbind enum users = yes does nothing for you exept slowing down your server.  
use getent passwd username  if you want to test users. 
 
this is missing/incorrect, i guess you missed this on the wiki. ( below is a correct part, yours is incorrect. 
        # Default idmap config for local BUILTIN accounts and groups
        idmap config * : backend = tdb
        idmap config * : range = 3000-7999

        # idmap config for the SAMDOM domain
        idmap config SAMDOM : backend = rid
        idmap config SAMDOM : range = 1000000-19999999
 
 
Your using RID, you you need to define, login and homdir if needed. 
        # Template settings for login shell and home directory
        winbind nss info = template
        template shell = /bin/bash
        template homedir = /home/%U
 
 
Greetz, 
 
Louis
 

 
Van: Akash Jain [mailto:akash.jain110683 at gmail.com] 
Verzonden: woensdag 13 december 2017 9:10
Aan: L.P.H. van Belle
CC: samba at lists.samba.org
Onderwerp: Re: [Samba] Intermittent failure of net ads join command with error "The transport connection is now disconnected"



Hi Louis


Thanks for your reply and the link. I have been following same document and I do not see any major difference. 
The SAMDOM.EXAMPLE.COM is the realm they are using for example but DOMAIN.COM is also valid realm in my case.
Can you please pin point the configuration line which can cause this intermittent failure? I believe if the configuration is not correct it will not succeed even once. 


Thanks
Akash






On Tue, Dec 12, 2017 at 4:48 PM, L.P.H. van Belle via samba <samba at lists.samba.org> wrote:
Your smb.conf is incorrect/incomplete.

Info here on these 2 links.
https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Domain_Member
https://wiki.samba.org/index.php/Idmap_config_rid

Your smb.conf
 > >> [global]
> >> max log size = 0
> >> realm = DOMAIN.COM
> >> workgroup = DOMAIN
> >> security = ADS
> >> winbind enum users = yes
> >> winbind enum groups = yes
> >> idmap config * : backend = autorid
> >> idmap config * : range = 1000000-19999999

But Yours should be something like:
[global]
       security = ADS
       workgroup = SAMDOM
       realm = SAMDOM.EXAMPLE.COM

       log file = /var/log/samba/%m.log
       log level = 1

        # Default idmap config for local BUILTIN accounts and groups
        idmap config * : backend = tdb
        idmap config * : range = 3000-7999

        # idmap config for the SAMDOM domain
        idmap config SAMDOM : backend = rid
        idmap config SAMDOM : range = 10000-999999

        # Template settings for login shell and home directory
        winbind nss info = template
        template shell = /bin/bash
        template homedir = /home/%U

Greetz,

Louis




> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens
> Akash Jain via samba
> Verzonden: dinsdag 12 december 2017 12:10
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] Intermittent failure of net ads join
> command with error "The transport connection is now disconnected"
>
> Hello All
>
> Can I get some response on above email.
>
> More Setup Details
>
> My AD Controller is Windows 2008 R2
> My Linux machine which is trying to join domain is CentOS
> Linux release
> 7.2.1511
> Samba version is Version 4.6.2
>
> Kindly help and let me know if I need to include more
> information in the
> email.
>
> Thanks
> Akash
>
> On Wed, Dec 6, 2017 at 1:42 PM, Akash Jain
> <akash.jain110683 at gmail.com>
> wrote:
>
> > Hello All
> >
> > Can someone please help me understand what could be the
> reason SPENGO
> > fails with windows AD server?
> >
> >   SPNEGO login failed: The transport connection is now disconnected.
> >   error_string             : 'failed to lookup DC info for domain '
> > DOMAIN.COM <http://domain.com/>' over rpc: The transport
> connection is
> > now disconnected.'
> >
> >
> >
> > Thanks in Advance
> >
> > Akash
> >
> > On Fri, Dec 1, 2017 at 4:55 PM, Akash Jain
> <akash.jain110683 at gmail.com>
> > wrote:
> >
> >> Hello All
> >>
> >> I am seeing following error intermittently when I try to
> join the samba
> >> machine into AD controlled by windows machine.
> >>
> >> Failed to join domain: failed to lookup DC info for domain '
> >> 3DFSTESTAD.COM' over rpc: The transport connection is now
> disconnected.
> >>
> >> If we repeat the same command with same configuration and
> credentials, it
> >> succeeds.
> >>
> >> Detailed logs at log level 5 are at end of the message.
> >>
> >>
> >> Command:
> >> net ads join -d5 -e -I <AD Controller IP>  -U
> administrator%<password>
> >>
> >> configuration details are as follows
> >>
> >> -------------------- smb.conf -----------------------
> >> [global]
> >> max log size = 0
> >> realm = DOMAIN.COM
> >> workgroup = DOMAIN
> >> security = ADS
> >> winbind enum users = yes
> >> winbind enum groups = yes
> >> idmap config * : backend = autorid
> >> idmap config * : range = 1000000-19999999
> >> passdb backend = tdbsam
> >>
> >> ------------------- krb5.conf ------------------------
> >> [libdefaults]
> >> default_realm = DOMAIN.COM
> >> dns_lookup_realm = false
> >> dns_lookup_kdc = true
> >> ticket_lifetime = 24h
> >> renew_lifetime = 7d
> >> forwardable = true
> >> rdns = false
> >> default_ccache_name = KEYRING:persistent:%{uid}
> >> [realms]
> >> DOMAIN.COM = {
> >> kdc = PDC.DOMAIN.COM
> >> admin_server = PDC.DOMAIN.COM
> >> }
> >> [domain_realm]
> >> domain = DOMAIN.COM
> >> .domain = DOMAIN.COM
> >>
> >>
> >> ------------------------------------------------------------
> >> ----------------------------------
> >>
> >> Log level 5 logs for net ads command are:
> >>
> >>
> >> Enter Administrator's password:libnet_Join:
> >>     libnet_JoinCtx: struct libnet_JoinCtx
> >>         in: struct libnet_JoinCtx
> >>             dc_name                  : NULL
> >>             machine_name             : 'Hostname'
> >>             domain_name              : *
> >>                 domain_name              : 'DOMAIN.COM'
> >>             domain_name_type         : JoinDomNameTypeDNS (1)
> >>             account_ou               : NULL
> >>             admin_account            : 'Administrator'
> >>             admin_domain             : NULL
> >>             machine_password         : NULL
> >>             join_flags               : 0x00000023 (35)
> >>                    0: WKSSVC_JOIN_FLAGS_IGNORE_UNSUPPORTED_FLAGS
> >>                    0: WKSSVC_JOIN_FLAGS_JOIN_WITH_NEW_NAME
> >>                    0: WKSSVC_JOIN_FLAGS_JOIN_DC_ACCOUNT
> >>                    0: WKSSVC_JOIN_FLAGS_DEFER_SPN
> >>                    0: WKSSVC_JOIN_FLAGS_MACHINE_PWD_PASSED
> >>                    0: WKSSVC_JOIN_FLAGS_JOIN_UNSECURE
> >>                    1: WKSSVC_JOIN_FLAGS_DOMAIN_JOIN_IF_JOINED
> >>                    0: WKSSVC_JOIN_FLAGS_WIN9X_UPGRADE
> >>                    0: WKSSVC_JOIN_FLAGS_ACCOUNT_DELETE
> >>                    1: WKSSVC_JOIN_FLAGS_ACCOUNT_CREATE
> >>                    1: WKSSVC_JOIN_FLAGS_JOIN_TYPE
> >>             os_version               : NULL
> >>             os_name                  : NULL
> >>             os_servicepack           : NULL
> >>             create_upn               : 0x00 (0)
> >>             upn                      : NULL
> >>             modify_config            : 0x00 (0)
> >>             ads                      : NULL
> >>             debug                    : 0x01 (1)
> >>             use_kerberos             : 0x00 (0)
> >>             secure_channel_type      : SEC_CHAN_WKSTA (2)
> >>             desired_encryption_types : 0x0000001f (31)
> >> Opening cache file at /var/lib/samba/gencache.tdb
> >> Opening cache file at /var/lib/samba/lock/gencache_notrans.tdb
> >> sitename_fetch: Returning sitename for realm 'DOMAIN.COM':
> >> "Default-First-Site-Name"
> >> ads_dns_lookup_srv: 1 records returned in the answer section.
> >> sitename_fetch: Returning sitename for realm 'DOMAIN.COM':
> >> "Default-First-Site-Name"
> >> no entry for PDC.DOMAIN.COM#20 found.
> >> resolve_hosts: Attempting host lookup for name PDC.DOMAIN.COM<0x20>
> >> namecache_store: storing 1 address for PDC.DOMAIN.COM#20:
> <AD Controller
> >> IP>
> >> Connecting to <AD Controller IP> at port 445
> >> E2BIG: convert_string(UTF-8,CP850): srclen=26 destlen=16 - '
> >> PDC.DOMAIN.COM'
> >> Connecting to <AD Controller IP> at port 139
> >> Socket options:
> >>         SO_KEEPALIVE = 0
> >>         SO_REUSEADDR = 0
> >>         SO_BROADCAST = 0
> >>         TCP_NODELAY = 1
> >>         TCP_KEEPCNT = 9
> >>         TCP_KEEPIDLE = 7200
> >>         TCP_KEEPINTVL = 75
> >>         IPTOS_LOWDELAY = 0
> >>         IPTOS_THROUGHPUT = 0
> >>         SO_REUSEPORT = 0
> >>         SO_SNDBUF = 87040
> >>         SO_RCVBUF = 367360
> >>         SO_SNDLOWAT = 1
> >>         SO_RCVLOWAT = 1
> >>         SO_SNDTIMEO = 0
> >>         SO_RCVTIMEO = 0
> >>         TCP_QUICKACK = 1
> >>         TCP_DEFER_ACCEPT = 0
> >> got OID=1.3.6.1.4.1.311.2.2.10
> >> GENSEC backend 'gssapi_spnego' registered
> >> GENSEC backend 'gssapi_krb5' registered
> >> GENSEC backend 'gssapi_krb5_sasl' registered
> >> GENSEC backend 'spnego' registered
> >> GENSEC backend 'schannel' registered
> >> GENSEC backend 'naclrpc_as_system' registered
> >> GENSEC backend 'sasl-EXTERNAL' registered
> >> GENSEC backend 'ntlmssp' registered
> >> GENSEC backend 'ntlmssp_resume_ccache' registered
> >> GENSEC backend 'http_basic' registered
> >> GENSEC backend 'http_ntlm' registered
> >> Starting GENSEC mechanism spnego
> >> Server claims it's principal name is
> not_defined_in_RFC4178 at PLEASE_IGNORE
> >> Starting GENSEC submechanism ntlmssp
> >> Got challenge flags:
> >> Got NTLMSSP neg_flags=0x62898215
> >>   NTLMSSP_NEGOTIATE_UNICODE
> >>   NTLMSSP_REQUEST_TARGET
> >>   NTLMSSP_NEGOTIATE_SIGN
> >>   NTLMSSP_NEGOTIATE_NTLM
> >>   NTLMSSP_NEGOTIATE_ALWAYS_SIGN
> >>   NTLMSSP_TARGET_TYPE_DOMAIN
> >>   NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY
> >>   NTLMSSP_NEGOTIATE_TARGET_INFO
> >>   NTLMSSP_NEGOTIATE_VERSION
> >>   NTLMSSP_NEGOTIATE_128
> >>   NTLMSSP_NEGOTIATE_KEY_EXCH
> >> NTLMSSP: Set final flags:
> >> Got NTLMSSP neg_flags=0x62088215
> >>   NTLMSSP_NEGOTIATE_UNICODE
> >>   NTLMSSP_REQUEST_TARGET
> >>   NTLMSSP_NEGOTIATE_SIGN
> >>   NTLMSSP_NEGOTIATE_NTLM
> >>   NTLMSSP_NEGOTIATE_ALWAYS_SIGN
> >>   NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY
> >>   NTLMSSP_NEGOTIATE_VERSION
> >>   NTLMSSP_NEGOTIATE_128
> >>   NTLMSSP_NEGOTIATE_KEY_EXCH
> >> NTLMSSP Sign/Seal - Initialising with flags:
> >> Got NTLMSSP neg_flags=0x62088215
> >>   NTLMSSP_NEGOTIATE_UNICODE
> >>   NTLMSSP_REQUEST_TARGET
> >>   NTLMSSP_NEGOTIATE_SIGN
> >>   NTLMSSP_NEGOTIATE_NTLM
> >>   NTLMSSP_NEGOTIATE_ALWAYS_SIGN
> >>   NTLMSSP_NEGOTIATE_EXTENDED_SESSIONSECURITY
> >>   NTLMSSP_NEGOTIATE_VERSION
> >>   NTLMSSP_NEGOTIATE_128
> >>   NTLMSSP_NEGOTIATE_KEY_EXCH
> >> SPNEGO login failed: The transport connection is now disconnected.
> >> libnet_Join:
> >>     libnet_JoinCtx: struct libnet_JoinCtx
> >>         out: struct libnet_JoinCtx
> >>             account_name             : NULL
> >>             netbios_domain_name      : NULL
> >>             dns_domain_name          : NULL
> >>             forest_name              : NULL
> >>             dn                       : NULL
> >>             domain_sid               : NULL
> >>                 domain_sid               : (NULL SID)
> >>             modified_config          : 0x00 (0)
> >>             error_string             : 'failed to lookup
> DC info for
> >> domain 'DOMAIN.COM' over rpc: The transport connection is now
> >> disconnected.'
> >>             domain_is_ad             : 0x00 (0)
> >>             set_encryption_types     : 0x00000000 (0)
> >>             result                   : WERR_NETNAME_DELETED
> >> return code = -1
> >> Failed to join domain: failed to lookup DC info for domain
> 'DOMAIN.COM'
> >> over rpc: The transport connection is now disconnected.
> >>
> >> ------------------------------------------------------------
> >> ------------------------------------------------------------------
> >>
> >> If we compare the Success vs Failure logs, we see only
> difference of
> >> following lines:
> >>
> >>
> >> Below lines are missing in Failure case:
> >> ----------------------------------------------
> >> Adding cache entry with key=[NBT/PDC.DOMAIN.COM#20] and
> timeout=[Thu
> >> Jan  1 05:30:00 1970 IST] (-1511892480 seconds in the past)
> >> no entry for PDC.DOMAIN.COM#20 found.
> >> resolve_hosts: Attempting host lookup for name PDC.DOMAIN.COM<0x20>
> >> namecache_store: storing 1 address for PDC.DOMAIN.COM#20:
> 172.16.72.124
> >> Adding cache entry with key=[NBT/PDC.DOMAIN.COM#20] and
> timeout=[Tue Nov
> >> 28 23:49:00 2017 IST] (660 seconds ahead)
> >> internal_resolve_name: returning 1 addresses: <AD Controller IP> :0
> >> -------------------------------------------------
> >>
> >> Also, OIDs are different.
> >>
> >> Please help me understand in what scenarios does domain
> controller will
> >> revoke the transport connection with SPNEGO failed for
> same flags and same
> >> inputs
> >>
> >> Thanks
> >> Akash
> >>
> >>
> >


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