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About a week ago iCloud's Back to My Mac service silently stopped working and will no longer start.

I discovered an error icon in System Preference's iCloud panel reporting the error: Back to My Mac isn't working because it couldn't start properly.

Following the trouble shooting steps provided by Apple has not fixed the problem. This includes restarting, and signing out & back into iCloud. An Apple support discussion thread, I cannot start Back To My Mac Since Wed Last Week, suggests this is not an isolated problem.

The system.log messages at the time of attempted enabling suggests an error occurred:

Jan 16 09:59:46 Mac-Pro com.apple.preferences.icloud.remoteservice[731]: AOSKit ERROR: LH request failed, url=https://p33-btmm.icloud.com:443/v1/hello, requestHeaders=
    {
        "Accept-Language" = "en-us";
        Authorization = "...";
        "X-Mme-Client-Info" = "<[redacted]> <Mac OS X;10.11.2;15C50> <com.apple.AOSKit/232 (com.apple.systempreferences/14.0)>";
        "X-Mme-Country" = GB;
        "X-Mme-Device-Id" = "[redacted]";
        "X-Mme-Timezone" = CET;
    },
    error=Error Domain=AOSErrorDomain Code=1000 "(null)" UserInfo={HttpStatusCode=503, DialogInfo={
        DialogType = Unknown;
    }}, httpStatusCode=503
Jan 16 09:59:46 Mac-Pro com.apple.preferences.icloud.remoteservice[731]: [AOSAccounts] : BTMM operation not successful 
Jan 16 09:59:46 Mac-Pro com.apple.preferences.icloud.remoteservice[731]: [AOSAccounts] : BTMM kMMServiceFailureNotification dictionary <CFBasicHash 0x7f921e2ba590 [0x7fff7c6cd440]>{type = mutable dict, count = 2,
    entries =>
        0 : <CFString 0x7fff7b7cc170 [0x7fff7c6cd440]>{contents = "ServiceFailureErrorKey"} = Error Domain=AOSErrorDomain Code=1000 "(null)" UserInfo={HttpStatusCode=503, DialogInfo={
        DialogType = Unknown;
    }}
        2 : <CFString 0x7fff7b7cc110 [0x7fff7c6cd440]>{contents = "ServiceFailureTypeKey"} = <CFString 0x7fff7b7cc130 [0x7fff7c6cd440]>{contents = "ServiceFailureTypeEnable"}
    }

I have reported the bug to Apple as rdar://24219994

Is there any solution?

  • Back to My Mac resumed working with no change on my part. Apple notified me through rdar://24219994 that a restart may be required but gave no detail about changes on their side. – Graham Miln Jan 22 '16 at 14:04
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In response to your question "Is there any solution?": Yes

Initial Feedback: I appear to have the same problem, which appeared out of the blue and which I noticed only on around 13 Jan (4 days prior). It appeared to have occurred at the same time as the last in a 3-4 week series of occasional spurious iCloud ID errors, requiring me to enter my iCloud password on each occasion. Back to my Mac is not accessible on any of the 3 macs using my personal account.

I spent 90 minutes on the phone with Apple Support. The problem could not be resolved immediately and was escalated to the level of the engineering staff for offline investigation.

Update: 3 days later BTMM was working correctly on all my machines, having been fixed at the Apple end. No explanation as yet as to the cause or how resolved. I recommend you contact Apple Support directly

  • Thank you for your insight and for contacting Apple. Your answer is helpful. – Graham Miln Jan 17 '16 at 17:18

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