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Windows 2008R2 explorer crashes on netapp unc path

Hi,

When we try to connect to our NetApp appliances from a W2008R2 machine, the Windows explorer.exe always crashes.

We tried it from several machines, put the problem is on everyone.

Does anybody have a clue ?

Thanks,
tom

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TechteamSita
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TechteamSita
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slemmesmiCommented:
Dear Tom,

sounds really strange.
In my case, no such problem mapping a network drive to a CIFS share hosted on our NetApp FAS', or writing directly to UNC path thereof (which we e.g. do for system disk imaging) on neither XP, 7, W2K3, W2008 or W2008R2.
1. Which Data Ontap is installed on your FAS?
2. Do you have the same/similar problem when accessing the CIFS share and/or UNC path from Windows 7 and/or Windows XP?
3. Please run the following command from the FAS' CLI and post the result here (you may wish to anonymize some of the options shown): options

Kind regards,
Soren
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slemmesmiCommented:
Dear Tom,

Please let me add to my question '2': Other versions of Windows Server (e.g. 2003, 2008 "non-R2")?
Also:
4. Do you see any error message when the explorer crash?
5. Am I correct in assuming when you write "Explorer" you mean the "File explorer" and not the "Internet Explorer"?
6. Please describe exactly the steps (step-by-step) you follow and which (re)produce the problem.

I believe this could be related to the ~snapshot folder and SMB2, but need you to answer my questions to be certain.

Kind regards,
Soren
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TechteamSitaAuthor Commented:
Hi Guru

1. Which Data Ontap is installed on your FAS?
    -> 7.3.4
    -> it's an NSeries  6040 a21 cluster
2. Do you have the same/similar problem when accessing the CIFS share and/or UNC path from Windows 7 and/or Windows XP?
    -> no only from w2K8 & W2K8R2 to the netapp AND if found out I don't have it to our older
        FAS3020 with ONTAP 7.2.4
4. Do you see any error message when the explorer crash?
    Fault generated in ntlanman.dll
5. Am I correct in assuming when you write "Explorer" you mean the "File explorer" and not the "Internet Explorer"?
    It's windows explorer, actually the complete shell drops and reloads
6. Please describe exactly the steps (step-by-step) you follow and which (re)produce the problem.
   I open a windows explorer  or a start->run and type "\\fileradress\share$ and it crashes


options.txt
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slemmesmiCommented:
Dear Tom,

I've had a look at the options.txt you posted and all CIFS and network options appears correct, and I do note your FAS has SMB2 enabled all ok.
Also your 7.3.4 is a very up-to-date Data Ontap version, so this really leaves me puzzled - never heard of exactly this scenario before, and I find it very peculiar that ntlanman.dll should cause the crash.
In addition to '6' - it could be worth checking/knowing if you have the problem when mapping a network drive to the \\fileradress\share$?
I am sorry I can't at this point help you much further, but at least advice you to open a support case with NetApp (or in the case of NSeries, IBM) as this for sure must be a problem on the FAS side (it can be 7.3.4).

Kind regards,
Soren

P.S. A "wild" shot - do you by any chance run McAfee AV on the servers, then it MAY be that causing "some conflict" (I've seen other problems caused by that, though not any having your exact scenario), and you could try disabling the McAfee services before trying to access the CIFS share.
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TechteamSitaAuthor Commented:
Hi Guru

* Mapping with net use works just fine.
* We had it even with ONTAP 7.3.3 (hoped that the upgrade would have helped)
* I tested without the AV but the same issue

I've opened a case with IBM .... Let's hope for the best

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slemmesmiCommented:
Dear Tom,

interesting that it works fine with mapping a network drive.
When you do \\fileradress\share$ is "fileraddress" then the fully qualified path (your FAS' FQDN)?
If not, try that out!
Could it be you use LMHOSTS lookup (and Netbios over TCP/IP), and if so; does the problem occur on a server on which (you e.g. just for testing purposes) disable LMHOSTS lookup?

Best of luck with IBM - I am really interested learning the outcome of this.

Kind regards,
Soren
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TechteamSitaAuthor Commented:
Hi Guru,

We've done some more testing:
We have 2 IBM's N-series in 1 cluster.

On 1 node, it works without crashing (this node has no netbios aliases configured)
On the node on which it crashes, Netbios aliases are configured.

I've tried 2 other things:
-disable the TCPIP Netbios helper service: I can't access the N-series anymore
-disable Netbios over TCPIP in the NIC properties: doesn't help, explorer still crashes

The Netbios aliases are necessary because of consolidation of N-series ...

Any idea 's ?

thanks!
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slemmesmiCommented:
Dear Tom,

sorry this one still puzzles the bej... out of me.
I'd recommned you pass on the information about Netbios further to the case you've opened with IBM, as it is for sure related.
It could be that there is an issue with Netbios and the SMB2 support.
I'll sleep better at night, when I learn about the cause and solution of your problem.

Kind regards,
Soren
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TechteamSitaAuthor Commented:
We have no real solution yet, but will persue our case @ IBM.
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