Network issue: Mountain Lion looses connection to NAS-Volumes after sleep

I have a new Mac Mini (late 2012) upgraded to 10.8.2 (not server). Since upgrading to 10.8.2, if my mac mini goes to sleep, it loses afp folder connections (ie to my QNAP NAS) but also loses Back to My Mac connection as well (I am unable to connect remotely but can connect to another computer on the network remotely via BTMM). Seems to me that 10.8.2 introduced a bug that affects network access trying to wake from sleep (on some computers). I have solved the problem by setting sleep to never in the Energy Saver while waiting for an official fix from Apple. This was not an issue with 10.8.1 on the same machine.

I expirince the same problem,

Just recently upgraded from Lion to ML (10.8.2) my 24 iMac (Mid 2007), before the upgrade everything worked fine - now whenever it goes to sleep the NAS is disconnected - cant work like that!

For now I'm gonna prevent it from sleeping but what can we do?

Does apple plans to fix it?

I've waited until 10.8.2 hoping to have less issues - I see I was wrong...

I have the impression (not really sure yet) the following command line instruction seems to have some effect:

sudo pmset -a hibernatemode 3

Positive or negative? 😉

I looked at my settings. My iMac uses Mode 0. With all the described problems of course...

The only difference i know between mode 0 and mode 3 is an additional copy of the RAM content on Harddisk in mode 3, which will only be used on power interruption or corrupted RAM content. Does anybody know if there is a different strategy for active software or drivers, connections or hardware (LAN adapter) between these two modes?

I'm still observing, but at least for the last 3 times it went to sleep after having entered the command, it woke up correclty with the Ethernet interface active. So for me it seems (so far) to have fixed the issue.

I was skeptical too but decided to give it a try.

So far after at least 1 sleep I haven't experienced a loss in connection either.

Also other applications running in the back like video conversion haven't hung up yet which they used to do quite often.

I will also test this further and report back because I really find it hard to believe this would fix my issue.

Hi,

dg1sek wrote:

I have the impression (not really sure yet) the following command line instruction seems to have some effect:

sudo pmset -a hibernatemode 3

I don't know how you got the command line, but it did the trick for me.

lost connection to my nas, when imac went into hybernate. Now, after resume, the nas is still present. I run my itunes on this NAS, and got continous messages that the library was not found. reconnecting to the nas, after first quiting itunes was the way to commence each and every single time. now it keeps connecting, now the automatic sync with my ipad and iphone work during the night..

thanks for your post!

MacEd.

Gonna try this too - hope it will solve the issue..

Thanx for the tip!!

I tried the suggested command line, but it didn't make a difference.

Still lost the network connections to my Synology NAS when the iMac went to sleep.

So I've tried the command line and worked until I've reset the computer - does it make sense?

Guess I'm back to no sleep to my computer...

Have you seen this? Suggests hibernation on the NAS is the issue:

http://forum.synology.com/enu/viewtopic.php?f=64&t=61399

Actually, if you read further in that thread, you'll see that the ultimate culprit was his router configuration:

"For the sake of completeness: Ultimately my problem turned out to be my router. The NetGear WNDR3700. In Lan Setup, I had to set the Rip Version. It is by default "Disabled" and I set it to "Rip_1". Now, even with the drives set to hybernate, my Synology no longer disappears. Nor does my Brother wireless printer become mysteriously unavailable."

HI everyone,

I had the same problem as you : loosing smb share after sleep. To solve it I untick the box "Wake for network acces" in System Preferences--> Energy Saver . Hope it gonna help you.

Cheers