[Pkg-samba-maint] Bug#801624: cifs-utils: mounting Windows DFS shares fail

[Jimmy Crossley]

>

-----------------------------
Jimmy Crossley, CISM, MCSE, NSA IAM, SSCP
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-----Original Message-----
>From: Mathieu Parent [mailto:math.parent at gmail.com]
>Sent: Tuesday, May 03, 2016 05:48
>To: 801624 at bugs.debian.org; Jimmy Crossley
>Subject: Re: cifs-utils: mounting Windows DFS shares fail
>
>Control: tag -1 + moreinfo
>
>On Mon, 12 Oct 2015 12:37:14 -0500 Jimmy Crossley
><jcrossley at conetrix.com> wrote:
>> Package: cifs-utils
>> Version: 2:6.4-1
>> Severity: normal
>>
>> Dear Maintainer,
>>
>> Mounting a Windows DFS (Distributed File System) fails with "mount error(115):
>> Operation now in progress"
>>
>> sudo mount -t cifs //internal.compu-share.com/data/ /mnt/data -o
>> noserverino,\user=jcrossley,pass=$PASSWORD,domain=compu-share,sec=ntlm
>> mount error(115): Operation now in progress
>> Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
>
>You have an antislash (\) before user. Can you double-check?
>
>> Using the actual name of the file server instead of the DFS name works.
>>
>> In this example, the DNS entry for internal.compu-share.com points to three
>> Windows Servers, which have referrals to the actual server.  The server is a
>> NetApp.  It appears as though the client is not following the referral.
>
>
>Can you look at
>http://superuser.com/questions/430163/cifs-share-mount-errors and see
>if it helps?
>
>Regards
>
>Mathieu Parent

Thanks for your response and kind attention to this matter.

I don't know for sure how that antislash got in there.  I think I was using two lines and it was on the end of one line and it got wrapped.  It just quotes the next character anyway.  I tried it without it and I still get the same results.

I looked over http://superuser.com/questions/430163/cifs-share-mount-errors and nothing helps there.  On this same Debian box, I run a Windows 7 virtual machine, and it can access the DFS shares just fine.  The Windows VM is on the same subnet, going through the same routers, etc. as the host Debian box.

I will add that sometimes I get

mount error(115): Operation now in progress

and sometimes

mount error(5): Input/output error

I can issue the same command over and over and I can't find any pattern to these messages.

I have also looked at the network traffic and although I don't understand much about what is going on, here is one thing is see that might help.

After the session is set up, the Debian box sends a GET_DFS_REFERRAL for \internal.compu-share.com\data.  The DFS server sends back two referrals, \CSI00-DC1\Data and \CSI00-DC2\Data.  These are two Windows servers that offer this DFS volume.  The very next packet that Debian box sends is a Logoff AndX Request, the server sends a Logoff AndX Reponse, and then the Debian box closes the TCP session with a FIN packet.  I think it should follow these referrals until it gets to the actual device that is offering the service.

Jimmy Crossley