The share map will fail and in the trace you would see the SMB server returns ACCESS_DENIED error for VALIDATE_NEGOTIATE_INFO. On windows 2012R2 client, try to map the same share using the same command used in step(1). On windows 2012R2 client, close the connection to the SMB3 server using TCPview tool.Ĥ. Note: Windows server does not allow to update a specific dialect so to simulate the use case, you would need to reassign IP of one of the interfaces on SMB3 server to SMB2.1 server and disable the interface on SMB3 server.ģ. On the SMB server, update the supported SMB dialect from SMB3 to SMB2. On windows 2012R2 client, map a share hosted by SMB3 server.Ģ. Note: The issue can be reproduced against Windows and Solaris server using windows 2012R2 client.ġ. But it looks like it could still be manifested on Windows2012R2 clients by following the steps below. This issue was fixed in windows 2012R2 and later clients. You may get different error messages depending on how you are accessing the file server. "When a Windows 8 RTM or Windows Server 2012 RTM-based client computer attempts to reconnect to a server which has been upgraded from SMB 2.1 to SMB 3.0 while the client held a mapped share, you might see a failure to reconnect. There is a known client-side SMB signing issue seen on Windows8 and Window2012 as documented by Microsoft here. The errors seen are "Invalid Signature" or "an extended error has occurred". This usually manifests as an inability to access already mapped shares. This document provides a procedure to resolve problems with SMB signing on Windows SMB3 clients. Oracle ZFS Storage Appliance Racked System ZS7-2 for PCA/CatC - Version All Versions and later Oracle ZFS Storage ZS7-2 High End TAA Compliant - Version All Versions and later Oracle ZFS Storage Appliance Racked System ZS7-2 High-End - Version All Versions and later Oracle ZFS Storage Appliance Racked System ZS7-2 Mid-Range - Version All Versions and later Oracle ZFS Backup Appliance ZS5-4 - Version All Versions and later How to Troubleshoot SMB Signing Issues Seen on Windows SMB3 Clients Upon Updating Supported SMB Dialect on the Server.
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