Strange issue with files in a network folder Server 2008 R2 - Files dissapear and re-appear

Background:

I've ran into an issue over the past couple of weeks that I haven't seen before.  A customer in a domain environment with server 2008 r2 just got a new network all-in-one device (SAVIN MP C305).  A vendor went on-site and set this up to send inbound faxes to a network folder via FTP.  FTP is configured via filezilla server and we used the same process with the prior brother printer that the new all-in-one replaced.

The vendor created a folder called "incoming faxes" that these faxes are sent to as a PDF document.  

The Issue:

Two users access these files from two different computers with two different user accounts.  Sometimes (yes, this is intermittent), the users see different files in the same folder.  One user may see 4 PDFs while the other sees 1 or none.  After rebooting the computer, or checking back 2 hours later, both computers will see the same number of files.  Hitting F5 to refresh the folder shows no change.

Steps we have tried:

We have verified folder permissions are good (ie both users are in the same groups, user group has full control over files in the folder).


We have verified file permissions are good (double checked to make sure files in the folder have the same permissions.

We have deleted and re-created the "incoming faxes" folder and reworked permissions

When we are lucky enough to see the problem, we have browsed to both mapped drive location and full UNC path on the network with the same results.  we have browsed via DOS window and performed a DIR on the folder and it shows the folder is empty with zero files.  At that exact same time, the other computer showed 2 PDFs.

We have never had an issue like this on this customer's server before or their network.  The domain controller is about 2 years old.  All switches are passive, network is gigabit.  They have many other shared and mapped folders and have no problems with inconsistent data anywhere else.  This only happens on the 1 folder after adding new printers to the network.
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computerwarriorsAsked:
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joyofsharingCommented:
Just a quick question, since how many days this server is up and running?
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computerwarriorsAuthor Commented:
@joyofsharing - this server has been in production for about 9 months.
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joyofsharingCommented:
Can you run this command on the affected server and post the output?
netsh int tcp show global
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computerwarriorsAuthor Commented:
@joyofsharing - here is the output - thanks

C:\Users\Administrator>netsh int tcp show global
Querying active state...

TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State          : enabled
Chimney Offload State               : automatic
NetDMA State                        : enabled
Direct Cache Acess (DCA)            : disabled
Receive Window Auto-Tuning Level    : normal
Add-On Congestion Control Provider  : ctcp
ECN Capability                      : disabled
RFC 1323 Timestamps                 : disabled
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joyofsharingCommented:
Thanks for the information.

In comment ID: 39511425, you said "this server has been in production for about 9 months".
So, does it means that server is not restarted since 9 months?
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computerwarriorsAuthor Commented:
It was restarted several weeks ago, but not since the issue started.   I'll reboot it since it's Sunday and repost of it happens again.
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actevolisCommented:
I Have exactly the same problem with one customer.

Sometimes, when one user scan a file to a network folder, which finding on a windows 2012 server, some users can or cannot see the file immediatly

If you have a solution for this issue, i'm very interested.
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computerwarriorsAuthor Commented:
This appears to be an issue with SMB2.1 which is on server 2008 R2 and Windows 7.  There is a glitch where files in network folders do not refresh properly.  You have to add a new file to the folder yourself (ie copy/paste) and then the correct info shows up.  OR, you can browse through powershell  (I think), OR you can just wait.  It can take 20 minutes, it can take 2 hours.

This is the registry patch you can apply, affecting the directory cache lifetime - by modifying it to zero, you essentially do not cache directory contents and poll it each time you view the folder or hit refresh.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters]
"DirectoryCacheLifetime"=dword:00000000

You must apply this to all workstations, not the server.  I applied it via group policy and it fixed the problems.  This was used to fix the same problem at 2 of our customer's locations.  I hope this help!!!
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actevolisCommented:
Thanks for your reply,

I try this in a few days and i tell you if the problem is resolved
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