Just created a visual webpart as sandbox solution, didn't changed a word other then adding some text to visual webpart, tried to deploy it but getting this exception,
it is a single server with dc, sql and everything on it (SP 2013)
An attempt to connect to the remote activator failed with exception '
Strangely enough, this fixes the problem for me on SharePoint 2013 instance installed on a Windows Domain Controller:
Set-SPLogLevel -Identity "SharePoint Foundation:Sandboxed Code Service" -TraceSeverity "Verbose"
Restart-Service -Name "SharePoint User Code Host"
Of course, I only use this in a non-production environment.
You can't run sandboxed code on a single server installation of SharePoint 2013 on Windows Server 2012 + domain controller. You can install and activate the solution without any problems, but any sandboxed code will throw the following error:
An unknown exception occurred while executing a sandboxed code solution request in the worker process.
Reference: http://www.jrjlee.com/2013/04/another-reason-to-stop-developing.html Check the comments of the link, there seems to be a workaround, I would not recommended it.
When you create a visual webpart, the ascx control file needs to be deployed to the physical path in controltemplates folder. However, sandboxed solutions cannot deploy the files to the physical path. This is one of the restrictions in Sandbox solutions.
