El Capitan 10.11.5 update SMB slow (bug)

Turn off packet signing for SMB 2 and SMB 3 connections - Apple Support

This answer was posted earlier, but Apple has released a support article specifically for this issue, so I've linked to it here. This resolved my SMB performance issues to my Synology NAS immediately from macOS 10.12.2. Unmount any shares, run through the article, remount your SMB share. Performance should be dramatically improved. Previously it was taking me 30+ min to copy a 4GB file to the NAS. After making the change, it took about 3 min to copy the same file.

Hello,

Thank you, it works.

Regards

Phil

Le 3 janv. 2017 à 18:34, Apple Support Communities Updates <discussions-updates@apple.com> a écrit :

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Caesar113 <https://discussions.apple.com/profile/Caesar113?ac_cid=tw123456> has posted in the OS X El Capitan community.

El Capitan 10.11.5 update SMB slow (bug) <https://discussions.apple.com/thread/7565683?answerId=31200152022#31200152022&ac_cid=tw123456#31200152>

Turn off packet signing for SMB 2 and SMB 3 connections - Apple Support <https://support.apple.com/en-us/HT205926>

This answer was posted earlier, but Apple has released a support article specifically for this issue, so I've linked to it here. This resolved my SMB performance issues to my Synology NAS immediately from macOS 10.12.2. Unmount any shares, run through the article, remount your SMB share. Performance should be dramatically improved. Previously it was taking me 30+ min to copy a 4GB file to the NAS. After making the change, it took about 3 min to copy the same file.

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Wow... happy I found this thread after what... 4-5 years of issues with Apple's smb implementation!

For me, performance immediately improved on both my Win2008R2 file server and my WD My Cloud drives.

My /etc/nsmb.conf file after the change is as follows; it looks like the biggest issue was the caching and asynchronous transfer limits; I bumped the cache up by 16x and the async by 4x for reading and writing and 10x for directories (randomly).

[default]

protocol_vers_map=6

dir_cache_max_cnt=32768

read_async_cnt=16

write_async_cnt=16

dir_cache_async_cnt=100

Incidentally, my problem wasn't really packet signing; that doesn't seem to have much impact either way so I left it intact.

Same here - very slow speeds to my Qnap-NAS (SMB) (also the mentioned 25Mbit . Before 10.11.5 I have had about 100Mbit).

Speed from my Windows10 machine is still ok => it is not a problem of the NAS.

At least you can still connect to an SMB share. 10.11.5 somehow broke that functionality on my Mac.

After updating to 10.11.5 I can no longer access shared folders/printers on network Windows PCs

Same here on 2 devices, iMac and Macbook Air, right after the 10.11.5 update. I started to have difficulties to connect to my WDMyCloud NAS through SMB. Speed of listing directories, very slow; speed of file transfer, very slow. Even got a -36 error code that prevent from copying files to the SMB share. Weird.

This seems to be an issue in 10.11.5. There has been a security update to SMB in April, that was included in this OS update. Since i updated my Mac I wasn't able to access my SMB shares on my Apple TV (4th Gen). I had to downgrade to 10.11.4 because the steps I used didn't work (using a guest account to log in).

More info here Samba stopped working

Same Problem here. Can't add any folder from my iMac or MacMini over SMB to my Sonos speakers. After installing a 10.11.4 Time machine backup on my iMac everything works fine again. To bad that i don't have a backup of my Mini. Hope Apple will fix this error quickly cause i don't want to make a clean install.

+1 ... I am only able to access by changing the network protocol specifier from SMB to CIFS, but the speed is less than 1/2 of AFP access to a MD MyCloud share.

Doesn't Apple do even basic testing?

Krutsch wrote:

+1 ... I am only able to access by changing the network protocol specifier from SMB to CIFS, but the speed is less than 1/2 of AFP access to a MD MyCloud share.

Doesn't Apple do even basic testing?

Thank you so much for the suggestion of switching from SMB to CIFS! I have not been able to access my shared folders for a few days now and it was driving me crazy. Switching to CIFS works (slowly) for me too. I'll be using that as a work-around until Apple fixes their SMB issues.

Now if only there was a workaround like this for shared printers...

Same problem here - NAS WD My Cloud.

I had to downgrade to 10.11.4. :/

An old problem may persist / recur.

Mac OS X v10.5, v10.6: About named streams on SMB-mounted NAS, Mac OS X, and Windows servers; "-36" or "-50" alerts may appear

Also an old article, but with info re the "-36" error: "Snow Leopard and File Sharing Tips and Reports"

There, scroll down to " TIP: Another take on smb.config fix for -36 file sharing error: edit nsmb.conf for "streams=no" "

Also there: "TIP: Linux SMB fix for -36 error works for OS X Server; and fix for 2 GB file copy limit"

And: "Reader confirms smb.conf edit fix for -36 SMB errors"

And: "TIP: An easier way to turn of streams to fix -36 error on NAS"

And: "TIP: Use Path Finder as another workaround for NAS error -36"

The Mac uses Unix permissions (rwx-rwx-rwx "read write execute" thing) and Access Control Lists ("ACLs"), while the Windows device uses ACLs. Sort-of-collisions or disagreements between which are in use for the data you are transferring, can slow down or stop altogether, the transfer of files / folders.

-

I'm having this issue too, Wd mycloud, following!

I'm also have SMB issues of all kinds since the update. SMB share drop or are unable to connect.

I have same issue - after update to 10.11.5 slow transfer to samba share on my NAS. The speed was ca. 120 MB/s before, now just ca. 25 MB/s.