samba - May 2010 - smbd/winbindd truncating user name: "Could not parse domain user"

Hello,

we have built Samba 3.5.2 with ADS support on Solaris 10 and joined the
server successfully into the domain. kinit, klist, wbinfo -g, wbinfo -u, net
ads info are working correctly.

Unfortunately whenever we want to access a share on the Solaris server from
our Windows XP / Windows 7 clients we get a logon box to specify username
and password.

smbd log file shows that the logon attempt is made with the correct user
(i.e. MYDOMAIN\WKAABC) but winbindd log file shows that the first character
of the username is missing (i.e. KAABC). We can not explain that weird
behaviour and have not found any hint in the documentation, bug database or
newsgroups.

Any help greatly appreciated!

Thanks,
Klaus

log.smbd
[2010/05/12 09:14:34.411902,  2] smbd/sesssetup.c:1390(setup_new_vc_session)
  setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all
old resources.
[2010/05/12 09:14:34.411964,  3]
smbd/sesssetup.c:1189(reply_sesssetup_and_X_spnego)
  Doing spnego session setup
[2010/05/12 09:14:34.412032,  3]
smbd/sesssetup.c:1231(reply_sesssetup_and_X_spnego)
  NativeOS=[Windows 2002 Service Pack 3 2600] NativeLanMan=[Windows 2002
5.1] PrimaryDomain=[]
[2010/05/12 09:14:34.412309,  5]
smbd/sesssetup.c:753(parse_spnego_mechanisms)
  parse_spnego_mechanisms: Got OID 1.2.840.48018.1.2.2
[2010/05/12 09:14:34.412364,  5]
smbd/sesssetup.c:753(parse_spnego_mechanisms)
  parse_spnego_mechanisms: Got OID 1.2.840.113554.1.2.2
[2010/05/12 09:14:34.412424,  5]
smbd/sesssetup.c:753(parse_spnego_mechanisms)
  parse_spnego_mechanisms: Got OID 1.3.6.1.4.1.311.2.2.10
[2010/05/12 09:14:34.412478,  3]
smbd/sesssetup.c:805(reply_spnego_negotiate)
  reply_spnego_negotiate: Got secblob of size 1483
[2010/05/12 09:14:34.433890,  3] libads/authdata.c:304(decode_pac_data)
  Found account name from PAC: WKAABC [Limited User]
[2010/05/12 09:14:34.434046,  3] smbd/sesssetup.c:338(reply_spnego_kerberos)
  Ticket name is [WKAABC at MYREALM]
[2010/05/12 09:14:34.434550,  5] lib/username.c:133(Get_Pwnam_alloc)
  Finding user MYDOMAIN\WKAABC
[2010/05/12 09:14:34.434609,  5] lib/username.c:77(Get_Pwnam_internals)
  Trying _Get_Pwnam(), username as lowercase is rcmlan\wkaabc
[2010/05/12 09:14:34.452351,  5] lib/username.c:85(Get_Pwnam_internals)
  Trying _Get_Pwnam(), username as given is MYDOMAIN\WKAABC
[2010/05/12 09:14:34.454281,  5] lib/username.c:104(Get_Pwnam_internals)
  Checking combinations of 0 uppercase letters in rcmlan\wkaabc
[2010/05/12 09:14:34.454428,  5] lib/username.c:110(Get_Pwnam_internals)
  Get_Pwnam_internals didn't find user [MYDOMAIN\WKAABC]!
[2010/05/12 09:14:34.454492,  5] lib/username.c:133(Get_Pwnam_alloc)
  Finding user WKAABC
[2010/05/12 09:14:34.454545,  5] lib/username.c:77(Get_Pwnam_internals)
  Trying _Get_Pwnam(), username as lowercase is wkaabc
[2010/05/12 09:14:34.455095,  5] lib/username.c:85(Get_Pwnam_internals)
  Trying _Get_Pwnam(), username as given is WKAABC
[2010/05/12 09:14:34.455676,  5] lib/username.c:104(Get_Pwnam_internals)
  Checking combinations of 0 uppercase letters in wkaabc
[2010/05/12 09:14:34.455746,  5] lib/username.c:110(Get_Pwnam_internals)
  Get_Pwnam_internals didn't find user [WKAABC]!
[2010/05/12 09:14:34.456052,  1] smbd/sesssetup.c:454(reply_spnego_kerberos)
  Username MYDOMAIN\WKAABC is invalid on this system
[2010/05/12 09:14:34.456164,  3] smbd/error.c:80(error_packet_set)
  error packet at smbd/sesssetup.c(459) cmd=115 (SMBsesssetupX)
NT_STATUS_LOGON_FAILURE

log.winbindd
[2010/05/12 09:14:34.451314,  3]
winbindd/winbindd_misc.c:385(winbindd_priv_pipe_dir)
  [17648]: request location of privileged pipe
[2010/05/12 09:14:34.452088,  2]
winbindd/winbindd.c:826(winbind_client_request_read)
  Could not read client request from fd 25: I/O error
[2010/05/12 09:14:34.452884,  3]
winbindd/winbindd_misc.c:352(winbindd_interface_version)
  [17648]: request interface version
[2010/05/12 09:14:34.453144,  3]
winbindd/winbindd_misc.c:385(winbindd_priv_pipe_dir)
  [17648]: request location of privileged pipe
[2010/05/12 09:14:34.453926,  3]
winbindd/winbindd_getpwnam.c:55(winbindd_getpwnam_send)
  getpwnam KAABC
[2010/05/12 09:14:34.453997,  5]
winbindd/winbindd_getpwnam.c:68(winbindd_getpwnam_send)
  Could not parse domain user: KAABC
[2010/05/12 09:14:34.454088,  5]
winbindd/winbindd_getpwnam.c:138(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_INVALID_PARAMETER
[2010/05/12 09:14:34.454768,  3]
winbindd/winbindd_getpwnam.c:55(winbindd_getpwnam_send)
  getpwnam
[2010/05/12 09:14:34.454828,  5]
winbindd/winbindd_getpwnam.c:68(winbindd_getpwnam_send)
  Could not parse domain user:
[2010/05/12 09:14:34.454915,  5]
winbindd/winbindd_getpwnam.c:138(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_INVALID_PARAMETER
[2010/05/12 09:14:34.455334,  3]
winbindd/winbindd_getpwnam.c:55(winbindd_getpwnam_send)
  getpwnam
[2010/05/12 09:14:34.455393,  5]
winbindd/winbindd_getpwnam.c:68(winbindd_getpwnam_send)
  Could not parse domain user:
[2010/05/12 09:14:34.455487,  5]
winbindd/winbindd_getpwnam.c:138(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_INVALID_PARAMETER
[2010/05/12 09:14:34.507586,  3]
winbindd/winbindd_getpwnam.c:55(winbindd_getpwnam_send)
  getpwnam kaabc
[2010/05/12 09:14:34.507655,  5]
winbindd/winbindd_getpwnam.c:68(winbindd_getpwnam_send)
  Could not parse domain user: kaabc
[2010/05/12 09:14:34.507744,  5]
winbindd/winbindd_getpwnam.c:138(winbindd_getpwnam_recv)
  Could not convert sid S-0-0: NT_STATUS_INVALID_PARAMETER

smb.conf
[global]
        security = ADS
        realm = MYREALM
        password server = adc01,adc02,adc03,adc04

        workgroup = MYDOMAIN

        log level = 5

        idmap uid = 10000-100000
        idmap gid = 10000-100000

        local master = no
        domain master = no

[root-home]
        path = /root