I have a Samba share on a LAN with 2008 PDC/DNS. Smb authenticates with AD and I have several Win7 Machines that can connect fine.

I recently added a couple of new computers to the LAN which were imaged the same way (same software, etc.; different hardware so different drivers) as the other machines and they have the same policies set.

I can not get the new machines to connect to the samba share no matter what. I am always met with either Unspecified Error 0x80004005 or Network Path not found.

I've turned off the firewall; set LANMAN auth to respond to NTLM only/send LM & NTLM responses/use NTLM session security if negotiated in Local Sec Policy > SEcurity Options; tried both ip and hostname to connect.

SMB log shows that authentication succeeds; but then connection is immediately killed by the client.

tcpdump shows nothing remarkable except that when trying to connect from the client via hostname there is an unknown packet type error:

ack 201 win 255 NBT Session Packet: Unknown packet type 0xABData: (41 bytes)

Here's a couple of lines from that error:

11:18:37.964991 IP 001-client.domain.local.49372 > smb.domain.local.netbios-ssn: P 1670:2146(476) ack 201 win 255 NBT Session Packet: Unknown packet type 0xABData: (41 bytes)
[000] AA 46 96 FA D5 99 33 75  0C C4 20 CE 26 42 F3 61  \252F\226\372\325\2313u \014\304 \316&B\363a
[010] F0 8C FB 65 18 17 40 A5  DB 42 BB 94 37 53 92 EC  \360\214\373e\030\027@\245 \333B\273\2247S\222\354
[020] 55 98 7F C4 AE 3D 6B 10  C4                       U\230\177\304\256=k\020 \304

11:18:37.964998 IP smb.domain.local.netbios-ssn > 001-client.domain.local.49372: . ack 2146 win 100

Here's smb.conf just in case (though don't see how if other machines are working fine):

[global]
    workgroup = MYDOMAIN
    realm = MYDOMAIN.LOCAL
    server string = domain|smb share
    interfaces = eth1
    security = ADS
    password server = 192.168.1.3
    log level = 2
    log file = /var/log/samba/%m.log
    smb ports = 139
    strict locking = no
    load printers = No
    local master = No
    domain master = No
    wins server = 192.168.1.3
    wins support = Yes
    idmap uid = 500-10000000
    idmap gid = 500-10000000
    winbind separator = +
    winbind enum users = Yes
    winbind enum groups = Yes
    winbind use default domain = Yes

[samba-share1]
    comment = SMB Share
    path = /home/share/smb/
    valid users = @"MYDOMAIN+Domain Users"
    admin users = @"MYDOMAIN+Domain Admins"
    guest ok = no
    read only = No
    create mask = 0765
    force directory mode = 0777

Any ideas what else I could try or look for? Or what might be the problem?

Thanks.