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Q: El Capitan 10.11.5 update SMB slow (bug)

Since i upgraded my Macbook Pro Retina 2015 to 10.11.5 SMB transfers speeds to my Synology NAS are not going faster then 25Mbit.

When i use AFP i get 110Mbit speeds to my nas.

 

Tested a Mac Mini which has 10.11.4 and the SMB and AFP speeds are good 110Mbit.

Upgraded that mac mini to 10.11.5 and i get 25Mbit speed max using SMB!

 

Seems like bug in the SMB protocol of El Capitan release 10.11.5

MacBook Pro with Retina display, OS X El Capitan (10.11.5)

Posted on May 18, 2016 7:45 AM

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Q: El Capitan 10.11.5 update SMB slow (bug)

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  • by Krutsch,

    Krutsch Krutsch Jun 1, 2016 2:11 PM in response to Seth Goldin
    Level 1 (9 points)
    Jun 1, 2016 2:11 PM in response to Seth Goldin

    Thanks for posting... very helpful. Not sure what Apple can do to fix that, but we shall see.

  • by Seth Goldin,

    Seth Goldin Seth Goldin Jun 2, 2016 12:13 PM in response to Seth Goldin
    Level 1 (4 points)
    Mac OS X
    Jun 2, 2016 12:13 PM in response to Seth Goldin

    Seth Goldin wrote:

     

    Quick update.

     

    1. Rather than mess with anything on the server side, I went ahead and just created a nsmb.conf file in /etc with vim. Mine didn't exist yet. sudois required. It's as simple as just writing into the file:
        1. [default] 
        2.  
        3.     client_signing=no 
    2. Restarting the OS X 10.11.5 client.

     

    I'm happy to report that everything's working fine now!

     

    A few notes:

    • There's a man page for nsmb.conf included in OS X, which details this flag.
    • When this nsmb.conf file is in /etc, and you put the flag in the [default] section, the settings are global for the whole boot disk. This will override any user-specific nsmb.conf you might have in the ~/Library/Preferences/nsmb.conf, if it exists for your user account.
    • My NAS is on an offline LAN, so I don't really need the added security of SMB signing. If your NAS is connected to the Internet, you may want to keep signing on, even at the cost of poor performance, or you may want to adjust your workflow so that your high-speed SMB shares are offline, safe, and don't require SMB signing, while you use SMB with signing to access your server online to protect against those man in the middle or Badlock attacks.

    Oops, I was looking at the server's man page when I wrote this. The actual flag in the client's nsmb.conf is `signing_required=no`. Sorry if I confused anyone.

  • by Patrick Merel1,

    Patrick Merel1 Patrick Merel1 Jun 2, 2016 6:08 PM in response to Seth Goldin
    Level 1 (17 points)
    Jun 2, 2016 6:08 PM in response to Seth Goldin

    The trick didn't work for me. Created as you explained the nsmb.conf file, rebooted, Finder mount fairly rapidly the volume but then finder still takes years to open folders and files. Damned.

    Edit: it works indeed better with signing|required. I made the confusion as well. Finder now opens folders and files the right speed ;-))

  • by BobHarris,

    BobHarris BobHarris Jun 2, 2016 6:06 PM in response to Patrick Merel1
    Level 6 (19,633 points)
    Mac OS X
    Jun 2, 2016 6:06 PM in response to Patrick Merel1

    Patrick Merel1 wrote:

     

    The trick didn't work for me. Created as you explained the nsmb.conf file, rebooted, Finder mount fairly rapidly the volume but then finder still takes years to open folders and files. Damned.

    Screen Shot 2016-06-02 at 9.03.30 PM.png

    Finder -> View -> Show View Options -> [_] Show icon preview (turn this off) for your SMB volume and folders

  • by Patrick Merel1,

    Patrick Merel1 Patrick Merel1 Jun 2, 2016 6:09 PM in response to BobHarris
    Level 1 (17 points)
    Jun 2, 2016 6:09 PM in response to BobHarris

    thanxx bob, it may help as well.

  • by howitzer1972,

    howitzer1972 howitzer1972 Jun 2, 2016 8:23 PM in response to Krutsch
    Level 1 (4 points)
    Jun 2, 2016 8:23 PM in response to Krutsch

    Really wished this worked for me but adding the nsmb.conf and making the change to the plist had no effect when connecting to my Synology DS413. Rebooted the Mac and the NAS and still got the spinning wheel anytime I opened a folder from the NAS through finder. Accessing it using afp:// or nfs:// works fine. Maybe my issue is specific to Synology devices? Not sure what else there is to try.

  • by Patrick Merel1,

    Patrick Merel1 Patrick Merel1 Jun 2, 2016 9:48 PM in response to howitzer1972
    Level 1 (17 points)
    Jun 2, 2016 9:48 PM in response to howitzer1972

    take care, this is not a plist file. I have used pathfinder to open the /etc invisible folder. I have selected a .conf file and duplicated it. I opened it with textedit, deleted the content, modified as explained by Seth and renamed it nsmb.conf Done. After reboot, the trick made it.

  • by RubyRobbins,

    RubyRobbins RubyRobbins Jun 3, 2016 3:04 AM in response to BobHarris
    Level 1 (12 points)
    Jun 3, 2016 3:04 AM in response to BobHarris

    Thank you so much Bob! This worked perfectly for me. I'm all up and running again after a frustrating few days trying to solve this. Thanks once again.

  • by howitzer1972,

    howitzer1972 howitzer1972 Jun 3, 2016 5:55 AM in response to Patrick Merel1
    Level 1 (4 points)
    Jun 3, 2016 5:55 AM in response to Patrick Merel1

    Patrick Merel1 wrote:

     

    take care, this is not a plist file. I have used pathfinder to open the /etc invisible folder. I have selected a .conf file and duplicated it. I opened it with textedit, deleted the content, modified as explained by Seth and renamed it nsmb.conf Done. After reboot, the trick made it.

    I meant in addition to creating the nsmb.conf I also edited com.apple.smb.server.plist as referenced here. Re: iOS File Share apps unable to access File Shares since 10.11.5.  Neither has worked for me.

  • by Josh Dam,

    Josh Dam Josh Dam Jun 9, 2016 6:52 PM in response to BobHarris
    Level 1 (4 points)
    Jun 9, 2016 6:52 PM in response to BobHarris

    That's worked for me too. Many thanks for this great support, bro !

  • by SagarMCP,

    SagarMCP SagarMCP Jun 20, 2016 6:44 AM in response to Samplex
    Level 1 (4 points)
    Jun 20, 2016 6:44 AM in response to Samplex

    I am having this issue and it is really annoying for me. I raised a case with Apple support, and during troubleshooting it is working when root account is enabled and logged in with that. I was asked to re-install a fresh OS and test if a standard admin / guest accounts will work after that. I am reluctant as I am, not really convinced that OS Reinstallation will fix it.

     

    anyhow, I will need to follow these steps. if I manage to get any solution in between are after I will share here.

  • by romaind,

    romaind romaind Jun 20, 2016 10:37 AM in response to BobHarris
    Level 1 (4 points)
    Jun 20, 2016 10:37 AM in response to BobHarris

    Thank you !! That solved my problem.. I couldn't connect to a windows drive via SMB as I used to before after updating to 10.11.5 !!

  • by Tom521,

    Tom521 Tom521 Jun 21, 2016 10:34 AM in response to Samplex
    Level 1 (4 points)
    Mac OS X
    Jun 21, 2016 10:34 AM in response to Samplex

    My Drobo 5N has this same problem. I had been using it while editing video with FCP-X but now it is unusable; the read rate has gone to about 1/6 of what it had been. Thank you Apple...

  • by BobHarris,

    BobHarris BobHarris Jun 21, 2016 6:41 PM in response to Tom521
    Level 6 (19,633 points)
    Mac OS X
    Jun 21, 2016 6:41 PM in response to Tom521
    Did you try any of the fixes suggested in this thread, or are you just complaining?
  • by Tom521,

    Tom521 Tom521 Jun 22, 2016 5:22 AM in response to BobHarris
    Level 1 (4 points)
    Mac OS X
    Jun 22, 2016 5:22 AM in response to BobHarris

    I love smart-*** questions, Bob. Especially that one.

     

    For your edification I have tried each and every suggestion; the /etc/nsmb.conf file, the process of mounting the drive using the Drobo software, the processes of mounting the drive using Finder, both as SMB and AFP, as the usual user and as Guest, the elimination of the icon preview and some others I can't recall I'm sure. Oh, and with reboots between each different change.

     

    BlackMagic speed test continues to give results between 10mbps and about 85mbps which are less than half of what it was before Apple's screwing up my PC yet again...

     

    BTW, FCP-X is back to disappearing after a certain mouse-click (can't predict that one yet but trying to be observant), similar to what it used to do several FCP/OSX updates ago - I always send the crash report - it seems FCP has got the "twitches", if I click on something it doesn't like, it goes poof! and disappears from my monitors. This behavior went away until the latest OSX update.

     

    For now, the Mac Pro is useless - no, worse, - aggravating - as I can no longer edit 4K video.

     

    If the Drobo speed could be improved back to where it was, I be at least able to try to return to editing instead of cussing at it...

     

    Is there a way to downgrade to 10.11.4?

     

    What will you do with my reply?

     

    Tom

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