Drive mappings disappearing randomly

We have about 120 machines that are randomly losing their mapped drives that are connected through GPO.   We also have 1 server that has a mapped drive to another server that can not make the connection.    The workstations that are having issues at times connect and at others do not.   This issue started about a week ago when MalwareBytes sent a bad update and locked most of our workstations to the point where we had to uninstall MalwareBytes from those systems.    The two servers that we map drives to also had MalwareBytes on them.   Sometimes if we do a gpupdate /force it fixes it but not all the time and the issue eventually comes back.

We do not have any problems mapping drives from those workstations to the servers through UNC.   That  is how the drives are being mapped through GPO.

Most workstations are Windows 7 but it also happens on Windows 10.  We are seeing this on a few workstations that also did not have MalwareBytes on them so it leads me to believe this is an issue with the two servers that had it installed.

On the workstations when you click on the drives you get the following error..
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Craig MainAsked:
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Bill BachPresident and Btrieve GuruCommented:
If the network name cannot be found, then the first thing I would check is DNS.  Make sure that you can PING the server(s) by name.  Windows will periodically disconnect a drive that is not actively being used, and will reconnect it when needed.  However, if the DNS services is going down, then attempting to reconnect would pop this error.

Additionally, consider installing Wireshark on one of the client machines and tracing data until the error occurs, then see what transpires at exactly the time of the failure.
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Craig MainAuthor Commented:
We just found that when machines can not connect to their drives (drive is mapped but a red X and no connection) if connect through windows explorer to the DFS \\mycompany.com\transfer it connects then all other drives letters connect when we click on them.
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DonNetwork AdministratorCommented:
Turn off auto disconnect feature

net config server /autodisconnect:-1

https://support.microsoft.com/en-us/help/297684/mapped-drive-connection-to-network-share-may-be-lost
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Craig MainAuthor Commented:
One the drives end up with a red X they do not  reconnect without some other intervention other than clicking on them.    Sometimes a reboot works, sometimes the gpupdate /force,  browsing to the share using DFS.   Clicking on them never works without running something first.
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Craig MainAuthor Commented:
We have also done the following.  At this point will need to wait until tomorrow to see if the issue is resolved.

Ran dfsutil /pktflush commands on DFS Servers according to MS Site may be related issue- will monitor mapped drives:
https://support.microsoft.com/en-us/help/983620/you-cannot-access-a-dfs-share-through-a-mapped-network-drive-on-a-comp
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Craig MainAuthor Commented:
We are still experiencing the issue on almost every system.  With my drives not connecting I am able to ping by name all DNS servers and the two file servers that we are trying to map to.
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Bill BachPresident and Btrieve GuruCommented:
Have you disabled the autodisconnect from the server yet?  Note that this command must be run on the SERVER, not on the workstations.
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Craig MainAuthor Commented:
We did disable the autodisconnect option on the servers but sill not luck.   We did change from mapping using DFS to using UNC and this appears to have resolved the issue.
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Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Craig Main (https:#a42463986)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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