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kurgan's avatar
kurgan
Copper Contributor
Mar 22, 2019
Solved

W10-1903 UNC path failing 0x80070043

I can no longer access network shares through unc paths \\server\share I get the 0x80070043 "Network name cannot be found" error.   I suspect that this is related to the removal of Homegroups? but ...
  • NedPyle's avatar
    NedPyle
    Jun 13, 2019

    Hi everyone. We got access to the Dell KB and see the issue in Dell/EMCs 'Unity' CIFS implementation.

     

    From the DELL EMC KB attached to thread (below), the Unity SMB Server implementation is failing on the "SMB2_NETNAME_CONTEXT" and "SMB2_COMPRESSION_CAPABILITIES" we added in 1903. These were changes designed to add some new capabilities to SMB; we make some variant of these at most OS releases. If an SMB/CIFS server doesn't recognize capabilities, it should ignore them, not fail. Otherwise Dell would have to update their SMB implementation every time we released a new SMB capability that didn't also include a protocol dialect revision (like "SMB 3.1.2"), forever and ever. 

     

    Error Messages in the Unity c4_safe_ktrace.log:


    sade:SMB: 3:[nas_serverx] Unrecognized SMB2 negotiate context type 0003
    sade:SMB: 3:[nas_serverx] Unrecognized SMB2 negotiate context type 0003

     

    SMB client sends the compression context before the netname context, so the server encounters the compression context first. The Unity server would probably encounter the same problem with the netname context. Instead of failing when their SMB Server version doesn't support more advanced capabilities, it should be ignoring those capabilities. This is what Windows and other 3rd party SMB products do.

     

    kurgan thanks for opening this techcommunity item, I'm sorry I didn't see it until now.

     

    Ned Pyle | Principal Program Manager, MS | @nerdpyle on twitter

tomatthe's avatar
tomatthe
Copper Contributor
Oct 10, 2019

DarrenMiller  They eventually said the luns were dropped during the restarts because there was a raid rebalance going at that time.  I'm not sure why that would cause it to drop connections, but that's what I was told.  I had replaced a drive in one of the sc2080's under the NAS head a few days before doing the restarts.  From the end user side I don't believe there is any way to actually see that the system is still balancing data after replacing a disk.

 

The amount of disk these arrays have dropped is at about 15% in 2.5 years of use which is about 10% worse then any other array I run fwiw.

itkpli's avatar
itkpli
Brass Contributor
Dec 04, 2019

tomatthe 

 

Just wanted to add that this issue is now addressed in Unity Operating Environment 5.0.1.0.5.011 and greater.

 

We upgraded our Unity's a few weeks ago and everything works in regards to Windows 10 1903 (and 1909) with SMB 3.1.1

 

 

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