SharePoint Foundation Sandboxed Code Service - Unable to activate worker process proxy object within the worker process

Question

Issue:
On a vanilla installation, the sandboxed code service (e.g. SPUCHostService.exe) is started; however, SPUCWorkerProcessProxy.exe and subsequently SPUCWorkerProcess.exe fails to start.
Resolution/Workarounds attempted:
Attempted 2 different Load balancing settings – local and remote (i.e. affinity)
Ensured local computer policy on server for ‘RPC Endpoint Mapper Client Authentication’ and ‘Restrictions for Unauthenticated RPC clients’ is disabled.
Ensured following key in registry is set properly - HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\RPC
Attempted to bypass SharePoint’s check for certificate revocations at crl.microsoft.com
Ensured the service account is added to the respective groups (e.g. Performance Log Users, Performance Monitor Users, IIS_IUSRS, WSS_ADMIN_WPG, WSS_WPG)
Increased limit of ‘AbnormalProcessTerminationCount’ of SPUserCodeService via Powershell
We have tried all possible workarounds from the following MSDN reference:
http://blogs.msdn.com/b/sharepointdev/archive/2011/02/08/error-the-sandboxed-code-execution-request-was-refused-because-the-sandboxed-code-host-service-was-too-busy-to-handle-the-request.aspx
ULS:
02/21/2014 05:24:50.64  SPUCHostService.exe (0x0230)  0x0F74  SharePoint Foundation Sandboxed Code Service              fe8a               
Medium               -  - Unable to activate worker process proxy object within the worker process: ipc://38432b45-2f32-4926-ade2-ef53ae1cd501:7000  
02/21/2014 05:24:50.64  SPUCHostService.exe (0x0230)  0x0F74  SharePoint Foundation Sandboxed Code Service              fe8c               
Medium               -  - Error activating the worker process manager instance within the worker process. - Inner Exception: System.InvalidOperationException: Unable to activate worker
process proxy object within the worker process: ipc://38432b45-2f32-4926-ade2-ef53ae1cd501:7000     at Microsoft.SharePoint.UserCode.SPUserCodeWorkerProcess.CreateWorkerProcessProxies()    
02/21/2014 05:24:50.64  SPUCHostService.exe (0x0230)  0x0F74  SharePoint Foundation Sandboxed Code Service              ei0t               
Medium               - Process creation/initialization threw an exception. Stopping this process. "ipc://38432b45-2f32-4926-ade2-ef53ae1cd501:7000"
02/21/2014 05:24:50.65  SPUCHostService.exe (0x0230)  0x0F74  SharePoint Foundation Sandboxed Code Service             
fe87                Medium               -  - Error activating the worker process manager instance within
the worker process. - Starting worker process threw - Inner Exception: System.InvalidOperationException: Unable to activate worker process proxy object within the worker process: ipc://38432b45-2f32-4926-ade2-ef53ae1cd501:7000     at Microsoft.SharePoint.UserCode.SPUserCodeWorkerProcess.CreateWorkerProcessProxies()   
Any other insights on how I can troubleshoot the issue described?
Thanks in advance!

Answer 1

Hi ,
For resolving your issue , you can do as the followings:
1. Logged into the Web Server with the Timer Service Account.
2. Ran the powershell command to check the SID of the account running the spucworkerprocessproxy.exe:  
$(Get-SPManagedAccount -Identity "THE SERVICE ACCOUNT").Sid.Value
3. Checked the registry :
HKEY_USERS\[SID OF THE SERVICE ACCOUNT]\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing\State
4. Changed the value 0x00023c00 to 0x00023e00
In addition, here are some similar posts for you to take a look at:
http://social.technet.microsoft.com/Forums/en-US/aae497df-5f0d-4f86-a724-c7b805ccd07f/sharepoint-sandboxed-code-service-troubles?forum=sharepointgeneralprevious
http://blogs.technet.com/b/operationsguy/archive/2011/01/17/sharepoint-2010-sandboxed-code-solutions-and-web-proxy.aspx
http://social.msdn.microsoft.com/Forums/en-US/c21e2c3a-a259-4d5f-8071-eff52b7bddc3/issue-sandbox-solution-too-busy-to-handle-the-request?forum=sharepointgeneralprevious
I hope this helps.
Thanks,
Wendy
Forum Support
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