An extended error has occurred

Thursday, July 10th, 2014

New operating systems always bring new error messages. Such was a recent incident for a Windows 2012 server trying to access a share on a Network Appliance Filer:

An extended error has occurred

A quick test of my Windows 8.1 laptop produced the same error.

We have been playing around with SMBv3 on the Netapp filers and this was thought to have been an issue as the new OS is more SMBv3 “friendly.”

The filer people said they configured the filer to use smbv2 but the error continued.

Originally, I wrote about this a year ago with this post but you can review the support article.

I suspected either signed support was not configured or can’t be used so I opted to disable it via Powershell and the command(start it in admin mode):

Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force

A reboot of the server (just because) and we had access to the share.

For those that want to get some features information on SMBv3 and 2012, you can look at this article.


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