Open Radar

 
Summary: 

awacsd crashes during connections through BTMM resulting in slow transfer and frequent disconnection.

Steps to Reproduce:

Any connection to a remote Mac results in the behavior.
- Connect to remote Mac in Finder
- Activate Screen Sharing
- ssh to hostname.id.members.btmm.icloud.com closed

It happens when the Macs are either on different networks or on the same network.

Expected Results:

Fast and reliable connections.

Actual Results:

Frequent disconnections and very slow data transfer rate (see below).

Regression:

Notes:

I have started experiencing Back To My Mac problems in the past week or two. I tracked my problem to the process called awacsd crashing all the time on both sides of the connection. The man page for it says:
 
awacsd is an executable invoked by launchd to facilitate connections between devices using Back to My Mac.
 
I am seeing in the logs that every few seconds awacsd would crash and then get restarted. While it is running, a few kilobytes of data will make through. Then it would crash again: 

:
 
8/14/12 11:40:27.769 AM          ReportCrash          DebugSymbols was unable to start a spotlight query: spotlight is not responding or disabled.
8/14/12 11:40:33.518 AM          com.apple.launchd          (com.apple.awacsd[23426]) Job appears to have crashed: Segmentation fault: 11
8/14/12 11:40:35.618 AM          awacsd          Starting awacsd connectivity-47.1 (Nov  8 2011 18:46:33)
8/14/12 11:40:35.948 AM          awacsd          Connecting AWACS client: **********.p01.members.btmm.icloud.com.
8/14/12 11:40:37.000 AM          kernel          utun_ctl_connect: creating interface utun0
8/14/12 11:40:37.000 AM          kernel          utun0: attached with 0 suspended link-layer multicast membership(s)
8/14/12 11:40:37.705 AM          ReportCrash          Saved crash report for awacsd[23426] version ??? (???) to /Library/Logs/DiagnosticReports/awacsd_2012-08-14-114037_localhost.crash
8/14/12 11:40:27.769 AM          ReportCrash          DebugSymbols was unable to start a spotlight query: spotlight is not responding or disabled.
8/14/12 11:40:33.518 AM          com.apple.launchd          (com.apple.awacsd[23426]) Job appears to have crashed: Segmentation fault: 11

I do not recall installing any software updates recently, but maybe I am missing something. I am wondering if Apple changed anything on their servers after the release of Mountain Lion. I am running Mac OS X 10.7.4 on both Macs. I use AT&T Motorola NVG510 router.

A few other users have reported the same problem on Apple's discussion forums:
https://discussions.apple.com/message/19275599