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Windows 7: Error accessing NAS shares

05 Feb 2010   #1

Windows 7 Enterprise
 
 
Error accessing NAS shares

Hello,

I have a DLink DNS-323 NAS device and since I have upgraded my laptop to Windows 7 Enterprise 64 bit I have problems accessing shares.

I am able to map a drive (both manually as via Explorer), but when I try to access the mapped drive I get an error "An unexpected network error occurred". See below an example from the commandline

This happens in all situations:
- When a username and password are required for the share. It does not matter whether the username and password are the same as a user on the laptop or a different one
- When access to the share is open for "ALL"
- Connecting via wireless and cable
- Addressing the devide by IP address, hostname and fully qualified hostname.

From another laptop with Windows XP PRO I still have access like I used to.

C:\>net use z: \\192.168.100.102\Docs /user:xxxxx
The command completed successfully.

C:\>z:
An unexpected network error occurred.


Please Help!


My System SpecsSystem Spec
.

05 Feb 2010   #2

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by TomTieDom View Post
Hello,

I have a DLink DNS-323 NAS device and since I have upgraded my laptop to Windows 7 Enterprise 64 bit I have problems accessing shares.

I am able to map a drive (both manually as via Explorer), but when I try to access the mapped drive I get an error "An unexpected network error occurred". See below an example from the commandline

This happens in all situations:
- When a username and password are required for the share. It does not matter whether the username and password are the same as a user on the laptop or a different one
- When access to the share is open for "ALL"
- Connecting via wireless and cable
- Addressing the devide by IP address, hostname and fully qualified hostname.

From another laptop with Windows XP PRO I still have access like I used to.

C:\>net use z: \\192.168.100.102\Docs /user:xxxxx
The command completed successfully.

C:\>z:
An unexpected network error occurred.


Please Help!

I suspect you are using "homegroup" for your networking. Homegroup is for win 7 only networks. Since yoou have XP on the network youo should be using "workgroup" for networking. there is a tutorial for leaving homegroup here. Homegroup - Leave


ken
My System SpecsSystem Spec
05 Feb 2010   #3

Windows 7 Enterprise
 
 

I'm not part of a homegroup: "There is currently no homegroup on your network. Because this computer belongs to a domain, you can't create your own homeegroup"
My System SpecsSystem Spec
.


05 Feb 2010   #4

 

try disabling ipv6
My System SpecsSystem Spec
06 Feb 2010   #5

Windows 7 Enterprise
 
 

I have now disabled IPv6, but still the same problem

What puzzles me is the fact that I am able to map the drive, so there is no problem with the credentials, but when I try to access the drive it gives a network error. Every once in a while it says something about a remote procedure call that did not succeed.
My System SpecsSystem Spec
09 Feb 2010   #6

Windows 7 Enterprise
 
 

I have made a network dump with Wireshark. I am not an SMB expert so I don't know if the below is normal behaviour.

Can somebody help me?

1. I map the directory \\NAS\DIR on drive letter Z:\
2. Windows 7 does a Session Setup twice
3. Windows 7 tries to open \desktop.ini. The NAS says it does not exist
4. Windows 7 tries to open '\'. The NAS opens it and says it's a directory.
5. Windows 7 does a Session Setup four times
6. Windows 7 gives the error "Z:\ is not accessible - An unexpected network error occurred."

No. Time Source Destination Protocol Info
32 14.963008 192.168.100.146 192.168.100.102 SMB Negotiate Protocol Request
33 14.977313 192.168.100.102 192.168.100.146 TCP microsoft-ds > 49568 [ACK] Seq=1 Ack=160 Win=6432 Len=0
34 14.983507 192.168.100.102 192.168.100.146 SMB Negotiate Protocol Response
35 15.183500 192.168.100.146 192.168.100.102 TCP 49568 > microsoft-ds [ACK] Seq=160 Ack=96 Win=17425 Len=0
43 22.724227 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user; Tree Connect AndX, Path: \\NAS\DIR
44 22.755653 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response; Tree Connect AndX
45 22.954996 192.168.100.146 192.168.100.102 TCP 49568 > microsoft-ds [ACK] Seq=368 Ack=214 Win=17307 Len=0
46 23.255229 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
48 23.267427 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
49 23.270984 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
50 23.277999 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
51 23.476956 192.168.100.146 192.168.100.102 TCP 49568 > microsoft-ds [ACK] Seq=568 Ack=406 Win=17115 Len=0
52 23.591795 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
53 23.602934 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
54 23.603464 192.168.100.146 192.168.100.102 SMB NT Create AndX Request, Path: \desktop.ini
55 23.617925 192.168.100.102 192.168.100.146 SMB NT Create AndX Response, FID: 0x0000, Error: STATUS_OBJECT_NAME_NOT_FOUND
56 23.620749 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
57 23.645069 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
58 23.645242 192.168.100.146 192.168.100.102 SMB NT Create AndX Request, FID: 0x12a6, Path: \
59 23.647636 192.168.100.102 192.168.100.146 SMB NT Create AndX Response, FID: 0x12a6
60 23.651410 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
61 23.677782 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
62 23.845908 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
63 23.855544 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
64 23.864421 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
65 23.873746 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
66 23.876494 192.168.100.146 192.168.100.102 SMB Session Setup AndX Request, User: DOMAIN\user
67 23.891579 192.168.100.102 192.168.100.146 SMB Session Setup AndX Response
68 24.092971 192.168.100.146 192.168.100.102 TCP 49568 > microsoft-ds [ACK] Seq=1374 Ack=1128 Win=16393 Len=0
My System SpecsSystem Spec
19 Feb 2010   #7

Windows 7 Ultimate
 
 

There is an apparant error with Windows 7. I opened a request with microsoft professional Help some weeks ago on this subject and they have been delving into my machine remotely to try and resolve the problem. I have three PC's on my home network. One using Windows XP, one with Vista and one with Windows 7. The XP and Vista macj=hine can both access my NAS either by mapping or from the network ico. Windows 7 will only access the NAS as a mapped drive.

Microsoft have made network traces from my Visat and Win 7 machines and advise that Win 7 sends the correct signals to the NAS but onlt get errors back. The same apparantly happens with the Vista machine but Vista ignores the errors and access the drive. I have tried unsuccessfully to obtain new firmware for the NAS and am waiting to see if Microsoft have any ideas. There are evidently more Security and Permissions additions in Win 7 over and above Vista. I suggest these are the problem.

It may be that we have to stick with the mapped drive route if MS do not offer any add ons.
My System SpecsSystem Spec
20 Feb 2010   #8

Windows 7 Enterprise
 
 

Quote   Quote: Originally Posted by spamnchips View Post
Microsoft have made network traces from my Visat and Win 7 machines and advise that Win 7 sends the correct signals to the NAS but onlt get errors back. The same apparantly happens with the Vista machine but Vista ignores the errors and access the drive. I have tried unsuccessfully to obtain new firmware for the NAS and am waiting to see if Microsoft have any ideas. There are evidently more Security and Permissions additions in Win 7 over and above Vista. I suggest these are the problem.

It may be that we have to stick with the mapped drive route if MS do not offer any add ons.
Thanks for your reaction. I still have not solved my problem and the mapped drive workaround does not work either. Please keep me posted from any progress you make with Microsoft. I am also willing to provide them with my network traces.
My System SpecsSystem Spec
20 Feb 2010   #9
aem

Windows 7 Ultimate 64Bit
 
 

Instead of mapping via command line. Can you go to start > type in the search box \\192.168.100.102\Docs and hit enter. See if it works.
My System SpecsSystem Spec
20 Feb 2010   #10

Windows 7 Enterprise
 
 

No, but I get a different errormessage:
"\\192.168.100.102\Docs" is not accessible. You might not have permission to use this network resource. Contact the network administrator of this server to find out if you have access permissions. - The system detected a possible attempt to compromise security. Please ensure that you can contact the server that authenticated you."

All shares on the NAS are open is open for ALL.

I find the last part of this error message strange: "Please ensure that you can contact the server that authenticated you." Which server has authenticated me?
My System SpecsSystem Spec
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 Error accessing NAS shares




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