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  1. Joined : Apr 2014
    Space coast of Florida
    Posts : 4,329
    Windows 10 Pro X64 14393.576
       19 Aug 2015 #31

    Sounds like it belongs to OneDrive. Maybe disable that and the problem goes away?

    Just noticed this has already been mentioned.
      My System SpecsSystem Spec


  2. Joined : Aug 2015
    Posts : 22
    Win10 Pro Build 10586
       21 Aug 2015 #32

    I've been getting "The Sync Host_Session1 service terminated unexpectedly" and it seems to be related to a problem I had when I upgraded to Windows 10. I've done a clean install, but fast user switching has never worked. I am always logged out when I switch so all my running apps are terminated. Every time I try to switch, the above message appears in the event log (I think this may be the only time I see the message).

    So I'm wondering whether I get logged off because the service failed.

    Does anyone have any more information about why the service fails?

    Sorry if this is slightly off topic.
      My System SpecsSystem Spec


  3. Joined : Aug 2015
    Posts : 7
    Windows 10
       22 Aug 2015 #33

    No one of those solutions work for me. Error still in event viewer
      My System SpecsSystem Spec


  4. Joined : Aug 2015
    Posts : 8
    Windows 10 Pro
       25 Aug 2015 #34

    A combination of deleting the OneSync Service (I'd already uninstalled One Sync) and setting the named services' "Start" DWORD value to 3 in HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services (see screenshot) worked for me.

    I'm using win10 Pro and these services are only listed as being valid for the Home version so god knows why they are present in Pro.

      My System SpecsSystem Spec


  5. Joined : Aug 2015
    Posts : 68
    Windows 7 & 10
       26 Aug 2015 #35

    WastedJoker said: View Post
    I'm using win10 Pro and these services are only listed as being valid for the Home version so god knows why they are present in Pro.
    They seem to be required for the Mail, Calendar and People apps (maybe others) to function, for both login and sync. Those apps are present in all Windows 10 editions, as far as I know.
      My System SpecsSystem Spec


  6. Joined : Aug 2015
    Posts : 4
    Windows 10 Pro
       29 Aug 2015 #36

    Was having a hell of a time with 100% disk activity and 90% CPU because of this ******* but... After removing it I did lose mail and calendar functionality as noted a few posts back. Unfortunately I removed it before then.

    My question is, how to I restore/reinstall the service? I've verified APhostservice.dll is where it's supposed to be. I've downloaded an ISO and attempted a dism repair... No luck. The error message listed a few posts back isn't quite right. It's 0x80070424, and it's associated with trustedinstaller/windows update.

    If I'm an idiot and missing something easy, feel free to call me out, but I honestly can't figure how to get the service installed an running short of a refresh, which seems like a really bad idea.

    Appreciate any assistance you can render.
      My System SpecsSystem Spec


  7. Joined : Aug 2015
    Posts : 4
    Windows 10 Pro
       02 Sep 2015 #37

    Seems no one wanted to take a swing at this... I figured a way around it for anyone who did delete the onesyncsvc as discussed earlier in this thread. I simply exported the registry folder from one of my machines that was still running a stock setup, ran the .reg file on my laptop and rebooted.

    I did encounter another error when attempting to readd the account to mail. Received 'account already exists' but I was able to get into account settings via calendar and delete the account remnant in question. Rebooted and done. I've installed and verified the account as a means to verify the above procedure was valid.

    I've attached the .reg folder from a clean pc. You can use it, or not, it's off a fresh install.
    Errors persisting in windows 10 even after clean install. Help needed! Attached Files
      My System SpecsSystem Spec


  8. Joined : Jul 2015
    Posts : 244
    windows 10 pro 64
       11 Oct 2015 #38

    hi
    may i know why is not OneSync Service listened in the service list services.msc ?

    i can't find it even in process hacker , or process explorer
    i can find it only with w10 task manager

    by the way i have the same errors
    The User Data Access_Session1 service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 10000 milliseconds: Restart the service.

    The User Data Storage_Session1 service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 10000 milliseconds: Restart the service.

    The Contact Data_Session1 service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 10000 milliseconds: Restart the service.

    The Sync Host_Session1 service terminated unexpectedly. It has done this 1 time(s). The following corrective action will be taken in 10000 milliseconds: Restart the service.
      My System SpecsSystem Spec


  9. Joined : Jul 2015
    SC
    Posts : 107
    Windows 10 Pro
       31 Oct 2015 #39

    Why is this listed as 'solved' I've read this post from stem to stern and all the remedies have only put off a few things. I'm getting the same errors and no matter if the Start in registry is set to 2 or 3 or 4 they all return after a few reboots. I too have been working on eliminating Event View errors and also am a W7 upgraded to W10. To me solved is when it doesn't happen anymore....just sayin.
      My System SpecsSystem Spec


  10. Joined : Jul 2015
    Posts : 79
    Windows 10 Pro 64bit
       31 Oct 2015 #40

    I marked it solved as the error was fixed for me and never got it again.
      My System SpecsSystem Spec


 
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