Re: Windows 10 issues with mapping drives to IFS

Three important documents of note when dealing with IFS are:

http://www-01.ibm.com/support/docview.wss?uid=nas8N1021348 -
NetServer support of SMB2 at V7R3 and support for Change Notify

http://www-01.ibm.com/support/docview.wss?uid=nas8N1017682 -
Change Notification APIs Not Supported by IBM i NetServer

http://www-01.ibm.com/support/docview.wss?uid=nas8N1019248 -
Integrated File System and IBM i NetServer Do Not Provide Support for
the Change Notification APIs, used by Microsoft Active Directory


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1
Group Dekko
Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From: Darren Strong <darren@xxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Date: 09/21/2016 03:56 PM
Subject: Re: Windows 10 issues with mapping drives to IFS
Sent by: "MIDRANGE-L" <midrange-l-bounces@xxxxxxxxxxxx>

There are still a lot of inconsistent behaviors and we haven't
pinpointed whether it is the user, computer, server.

We do know that drives do get mapped to the Windows server based
shares with no problem. We have recently upgraded from 7.1 to 7.3 a few
weeks ago. That's when the issues seem to pop up, but still unsure of
that is the issue.

Has anyone else experienced anything similar with their IBM i and
Windows 10 desktops?

-JA-

--
Jason Aleski / IT Specialist

I don't recall all of the details, but for us, going to 7.3 affected
Windows 7 on up.

The following paragraphs are an explanation from our system admin as to
the
results of his research. We did some workarounds, that I can't find right
now, one of them being a test on my registry. I do know that I don't use
drive letter shares to the IFS anymore as one workaround. I use network
shortcuts.

IBM changed protocol for NetServer from SMB1 to SMB2 when upgraded to IBM
i
7.3.

When you are running SMB2 Windows File Explorer will refresh the list of
files shown multiple times per second. This is a violation of SMB
protocol. Microsoft admits this but currently has no plans to change
this.

Microsoft has done this in the past and have issued a hotfix. They have
no
plans at this time to issue a hotfix for this occurrence.

Due to serious security issues IBM is strongly discouraging you from
configuring back to SMB1.

There is a registry hack to reduce the refresh rate. Or you can stop
using
Windows File Explorer. For example, looking at a mapped drive from a DOS
prompt does not have this issue. Having a file open from a share (like
Excel, PDF, etc) does not have this issue. Just the list of files shown
in
Windows File Explorer.

So far the Denial of service attack only causes issues with the windows
file explorer sessions. We've not noticed other performance implications
(YMMV).

http://www-01.ibm.com/support/docview.wss?uid=nas8N1021348

IBM would like more people to report this issue to them, and to Microsoft,
to put the pressure on Microsoft to fix this.



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