Hi everyone, I need some suggestion.Windows Server 2008 (IP=10.0.0.1 ) is a Domain Controller (Domain CIGIMMO) and responds with The specified network name is no longer available after running Start, run, \\ls-backup1 (IP=10.0.0.15). Ls-backup1 is a Buffalo Link Station NAS and configured with PUBLIC shares.Its no problem to have an access from the Server to all PCs in the Domain, running\\workstation-01, \\workstation-02 etc. and you have also access from PCs workstation-xx to all NAS devices.On the other hand server always responds The specified network name is no longer available, it doesnt matter what external storage is used.Server Configuration:No Firewall or Antivirus Software running.LmCompatibilityLevel=1 (REG_DWORD).Wireschark Report attached below. The Server does 7 times Negotiate Protocol request, "Session Setup AndX Request", "Tree Connect AndX Request" ... and breaks the communication.Can anyone offer a suggestion?Thanks in advance for any assistance.No. Time Source Destination Protocol Info 213 3.303783 10.0.0.1 10.0.0.15 SMB Tree Connect AndX Request, Path: \\LS-BACKUP1\IPC$Frame 213 (144 bytes on wire, 144 bytes captured) Arrival Time: Mar 9, 2009 16:29:37.314673000 [Time delta from previous captured frame: 0.000182000 seconds] [Time delta from previous displayed frame: 0.000182000 seconds] [Time since reference or first frame: 3.303783000 seconds] Frame Number: 213 Frame Length: 144 bytes Capture Length: 144 bytes [Frame is marked: False] [Protocols in frame: eth:ip:tcp:nbss:smb] [Coloring Rule Name: Checksum Errors] [Coloring Rule String: cdp.checksum_bad==1 || edp.checksum_bad==1 || ip.checksum_bad==1 || tcp.checksum_bad==1 || udp.checksum_bad==1]Ethernet II, Src: Broadcom_3d:44:e4 (00:10:18:3d:44:e4), Dst: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) Destination: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) Address: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) Source: Broadcom_3d:44:e4 (00:10:18:3d:44:e4) Address: Broadcom_3d:44:e4 (00:10:18:3d:44:e4) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) Type: IP (0x0800)Internet Protocol, Src: 10.0.0.1 (10.0.0.1), Dst: 10.0.0.15 (10.0.0.15) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 130 Identification: 0x4711 (18193) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0x0000 [incorrect, should be 0x9f55] [Good: False] [Bad : True] Source: 10.0.0.1 (10.0.0.1) Destination: 10.0.0.15 (10.0.0.15)Transmission Control Protocol, Src Port: fiorano-rtrsvc (1855), Dst Port: microsoft-ds (445), Seq: 573, Ack: 566, Len: 90 Source port: fiorano-rtrsvc (1855) Destination port: microsoft-ds (445) Sequence number: 573 (relative sequence number) [Next sequence number: 663 (relative sequence number)] Acknowledgement number: 566 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 65024 (scaled) Checksum: 0x1484 [incorrect, should be 0xe3e1 (maybe caused by "TCP checksum offload"?)] [Good Checksum: False] [Bad Checksum: True] [SEQ/ACK analysis] [This is an ACK to the segment in frame: 212] [The RTT to ACK the segment was: 0.000182000 seconds]NetBIOS Session Service Message Type: Session message Length: 86SMB (Server Message Block Protocol) SMB Header Server Component: SMB [Response in: 214] SMB Command: Tree Connect AndX (0x75) NT Status: STATUS_SUCCESS (0x00000000) Flags: 0x18 0... .... = Request/Response: Message is a request to the server .0.. .... = Notify: Notify client only on open ..0. .... = Oplocks: OpLock not requested/granted ...1 .... = Canonicalized Pathnames: Pathnames are canonicalized .... 1... = Case Sensitivity: Path names are caseless .... ..0. = Receive Buffer Posted: Receive buffer has not been posted .... ...0 = Lock and Read: Lock&Read, Write&Unlock are not supported Flags2: 0xc817 1... .... .... .... = Unicode Strings: Strings are Unicode .1.. .... .... .... = Error Code Type: Error codes are NT error codes ..0. .... .... .... = Execute-only Reads: Don't permit reads if execute-only ...0 .... .... .... = Dfs: Don't resolve pathnames with Dfs .... 1... .... .... = Extended Security Negotiation: Extended security negotiation is supported .... .... .0.. .... = Long Names Used: Path names in request are not long file names .... .... .... .1.. = Security Signatures: Security signatures are supported .... .... .... ..1. = Extended Attributes: Extended attributes are supported .... .... .... ...1 = Long Names Allowed: Long file names are allowed in the response Process ID High: 0 Signature: AE839531B3D434F1 Reserved: 0000 Tree ID: 0 Process ID: 65279 User ID: 101 (CIGIMMO\Administrator) [Primary Domain: CIGIMMO] [Account: Administrator] [Logged In: 212] Multiplex ID: 192 Tree Connect AndX Request (0x75) Word Count (WCT): 4 AndXCommand: No further commands (0xff) Reserved: 00 AndXOffset: 86 Flags: 0x0008 .... .... .... ...0 = Disconnect TID: Do NOT disconnect TID Password Length: 1 Byte Count (BCC): 43 Password: 00 Path: \\LS-BACKUP1\IPC$ Service: ?????No. Time Source Destination Protocol Info 213 3.303783 10.0.0.1 10.0.0.15 SMB Tree Connect AndX Request, Path: \\LS-BACKUP1\IPC$Frame 213 (144 bytes on wire, 144 bytes captured) Arrival Time: Mar 9, 2009 16:29:37.314673000 [Time delta from previous captured frame: 0.000182000 seconds] [Time delta from previous displayed frame: 0.000182000 seconds] [Time since reference or first frame: 3.303783000 seconds] Frame Number: 213 Frame Length: 144 bytes Capture Length: 144 bytes [Frame is marked: False] [Protocols in frame: eth:ip:tcp:nbss:smb] [Coloring Rule Name: Checksum Errors] [Coloring Rule String: cdp.checksum_bad==1 || edp.checksum_bad==1 || ip.checksum_bad==1 || tcp.checksum_bad==1 || udp.checksum_bad==1]Ethernet II, Src: Broadcom_3d:44:e4 (00:10:18:3d:44:e4), Dst: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) Destination: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) Address: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) Source: Broadcom_3d:44:e4 (00:10:18:3d:44:e4) Address: Broadcom_3d:44:e4 (00:10:18:3d:44:e4) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) Type: IP (0x0800)Internet Protocol, Src: 10.0.0.1 (10.0.0.1), Dst: 10.0.0.15 (10.0.0.15) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 130 Identification: 0x4711 (18193) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 128 Protocol: TCP (0x06) Header checksum: 0x0000 [incorrect, should be 0x9f55] [Good: False] [Bad : True] Source: 10.0.0.1 (10.0.0.1) Destination: 10.0.0.15 (10.0.0.15)Transmission Control Protocol, Src Port: fiorano-rtrsvc (1855), Dst Port: microsoft-ds (445), Seq: 573, Ack: 566, Len: 90 Source port: fiorano-rtrsvc (1855) Destination port: microsoft-ds (445) Sequence number: 573 (relative sequence number) [Next sequence number: 663 (relative sequence number)] Acknowledgement number: 566 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 65024 (scaled) Checksum: 0x1484 [incorrect, should be 0xe3e1 (maybe caused by "TCP checksum offload"?)] [Good Checksum: False] [Bad Checksum: True] [SEQ/ACK analysis] [This is an ACK to the segment in frame: 212] [The RTT to ACK the segment was: 0.000182000 seconds]NetBIOS Session Service Message Type: Session message Length: 86SMB (Server Message Block Protocol) SMB Header Server Component: SMB [Response in: 214] SMB Command: Tree Connect AndX (0x75) NT Status: STATUS_SUCCESS (0x00000000) Flags: 0x18 0... .... = Request/Response: Message is a request to the server .0.. .... = Notify: Notify client only on open ..0. .... = Oplocks: OpLock not requested/granted ...1 .... = Canonicalized Pathnames: Pathnames are canonicalized .... 1... = Case Sensitivity: Path names are caseless .... ..0. = Receive Buffer Posted: Receive buffer has not been posted .... ...0 = Lock and Read: Lock&Read, Write&Unlock are not supported Flags2: 0xc817 1... .... .... .... = Unicode Strings: Strings are Unicode .1.. .... .... .... = Error Code Type: Error codes are NT error codes ..0. .... .... .... = Execute-only Reads: Don't permit reads if execute-only ...0 .... .... .... = Dfs: Don't resolve pathnames with Dfs .... 1... .... .... = Extended Security Negotiation: Extended security negotiation is supported .... .... .0.. .... = Long Names Used: Path names in request are not long file names .... .... .... .1.. = Security Signatures: Security signatures are supported .... .... .... ..1. = Extended Attributes: Extended attributes are supported .... .... .... ...1 = Long Names Allowed: Long file names are allowed in the response Process ID High: 0 Signature: AE839531B3D434F1 Reserved: 0000 Tree ID: 0 Process ID: 65279 User ID: 101 (CIGIMMO\Administrator) [Primary Domain: CIGIMMO] [Account: Administrator] [Logged In: 212] Multiplex ID: 192 Tree Connect AndX Request (0x75) Word Count (WCT): 4 AndXCommand: No further commands (0xff) Reserved: 00 AndXOffset: 86 Flags: 0x0008 .... .... .... ...0 = Disconnect TID: Do NOT disconnect TID Password Length: 1 Byte Count (BCC): 43 Password: 00 Path: \\LS-BACKUP1\IPC$ Service: ?????No. Time Source Destination Protocol Info 214 3.311938 10.0.0.15 10.0.0.1 SMB Tree Connect AndX ResponseFrame 214 (106 bytes on wire, 106 bytes captured) Arrival Time: Mar 9, 2009 16:29:37.322828000 [Time delta from previous captured frame: 0.008155000 seconds] [Time delta from previous displayed frame: 0.008155000 seconds] [Time since reference or first frame: 3.311938000 seconds] Frame Number: 214 Frame Length: 106 bytes Capture Length: 106 bytes [Frame is marked: False] [Protocols in frame: eth:ip:tcp:nbss:smb] [Coloring Rule Name: SMB] [Coloring Rule String: smb || nbss || nbns || nbipx || ipxsap || netbios]Ethernet II, Src: Buffalo_f5:51:a8 (00:16:01:f5:51:a8), Dst: Broadcom_3d:44:e4 (00:10:18:3d:44:e4) Destination: Broadcom_3d:44:e4 (00:10:18:3d:44:e4) Address: Broadcom_3d:44:e4 (00:10:18:3d:44:e4) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) Source: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) Address: Buffalo_f5:51:a8 (00:16:01:f5:51:a8) .... ...0 .... .... .... .... = IG bit: Individual address (unicast) .... ..0. .... .... .... .... = LG bit: Globally unique address (factory default) Type: IP (0x0800)Internet Protocol, Src: 10.0.0.15 (10.0.0.15), Dst: 10.0.0.1 (10.0.0.1) Version: 4 Header length: 20 bytes Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) 0000 00.. = Differentiated Services Codepoint: Default (0x00) .... ..0. = ECN-Capable Transport (ECT): 0 .... ...0 = ECN-CE: 0 Total Length: 92 Identification: 0x41c7 (16839) Flags: 0x04 (Don't Fragment) 0... = Reserved bit: Not set .1.. = Don't fragment: Set ..0. = More fragments: Not set Fragment offset: 0 Time to live: 64 Protocol: TCP (0x06) Header checksum: 0xe4c5 [correct] [Good: True] [Bad : False] Source: 10.0.0.15 (10.0.0.15) Destination: 10.0.0.1 (10.0.0.1)Transmission Control Protocol, Src Port: microsoft-ds (445), Dst Port: fiorano-rtrsvc (1855), Seq: 566, Ack: 663, Len: 52 Source port: microsoft-ds (445) Destination port: fiorano-rtrsvc (1855) Sequence number: 566 (relative sequence number) [Next sequence number: 618 (relative sequence number)] Acknowledgement number: 663 (relative ack number) Header length: 20 bytes Flags: 0x18 (PSH, ACK) 0... .... = Congestion Window Reduced (CWR): Not set .0.. .... = ECN-Echo: Not set ..0. .... = Urgent: Not set ...1 .... = Acknowledgment: Set .... 1... = Push: Set .... .0.. = Reset: Not set .... ..0. = Syn: Not set .... ...0 = Fin: Not set Window size: 9056 (scaled) Checksum: 0x527e [correct] [Good Checksum: True] [Bad Checksum: False] [SEQ/ACK analysis] [This is an ACK to the segment in frame: 213] [The RTT to ACK the segment was: 0.008155000 seconds]NetBIOS Session Service Message Type: Session message Length: 48SMB (Server Message Block Protocol) SMB Header Server Component: SMB [Response to: 213] [Time from request: 0.008155000 seconds] SMB Command: Tree Connect AndX (0x75) NT Status: STATUS_SUCCESS (0x00000000) Flags: 0x88 1... .... = Request/Response: Message is a response to the client/redirector .0.. .... = Notify: Notify client only on open ..0. .... = Oplocks: OpLock not requested/granted ...0 .... = Canonicalized Pathnames: Pathnames are not canonicalized .... 1... = Case Sensitivity: Path names are caseless .... ..0. = Receive Buffer Posted: Receive buffer has not been posted .... ...0 = Lock and Read: Lock&Read, Write&Unlock are not supported Flags2: 0xc801 1... .... .... .... = Unicode Strings: Strings are Unicode .1.. .... .... .... = Error Code Type: Error codes are NT error codes ..0. .... .... .... = Execute-only Reads: Don't permit reads if execute-only ...0 .... .... .... = Dfs: Don't resolve pathnames with Dfs .... 1... .... .... = Extended Security Negotiation: Extended security negotiation is supported .... .... .0.. .... = Long Names Used: Path names in request are not long file names .... .... .... .0.. = Security Signatures: Security signatures are not supported .... .... .... ..0. = Extended Attributes: Extended attributes are not supported .... .... .... ...1 = Long Names Allowed: Long file names are allowed in the response Process ID High: 0 Signature: 0000000000000000 Reserved: 0000 Tree ID: 1 (\\LS-BACKUP1\IPC$) [Path: \\LS-BACKUP1\IPC$] [Mapped in: 214] Process ID: 65279 User ID: 101 (CIGIMMO\Administrator) [Primary Domain: CIGIMMO] [Account: Administrator] [Logged In: 212] Multiplex ID: 192 Tree Connect AndX Response (0x75) Word Count (WCT): 3 AndXCommand: No further commands (0xff) Reserved: 00 AndXOffset: 0 Optional Support: 0x0001 .... .... .... ...1 = Search Bits: Exclusive search bits supported .... .... .... ..0. = In Dfs: Share isn't in Dfs Byte Count (BCC): 7 Service: IPC Native File System:

+ i hope we have cleared negotiate protocol step before heading to tree connect (IPC$)+ Can you please share more details - OS running on name LS-backup1? does that box has IPC$ shared?+ If you have Server 2003, does he able to connect same share?+ You have mentioned that clients can access DC and NAS device as well. Is it vista clients or XP clients?+ Server 2008 and Vista came up with SMB2 protocol (used to connect UNC path), it might be causing issue. Try to disable SMB2 protocol on Server 2008 to test, how it goes. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters Edit menu, point to New , and then click DWORD Value,Type SMB2 , set value to "0" (zero).Hope this helps.

Hi Shilpesh,Thank You very much for Your valuable Suggestion! After disabling SMB2 on the Server 2008 (client)wir have now an access to all NAS Devices.(http://www.petri.co.il/how-to-disable-smb-2-on-windows-vista-or-server-2008.htm)__________________________________________________________________________________________Q.: OS running on name LS-backup1?A.: LS-Backup responds: Unix, LAN Manager Samba 3.0.24-1.22q.: If you have Server 2003, does he able to connect same share?A.: Yes, it is able to connect same shareQ.: You have mentioned that clients can access DC and NAS device as well. Is it vista clients or XP clients?A.: XP SP2/SP3 clients__________________________________________________________________________________________Thank you again for your very good instructions!Grigori