Error: "No available sandboxed code execution server could be found"

Hi,

This is my scenario:

1. Someone created a SharePoint site and saved it as a template.

2. The template was used to create another site programmatically:

// web is my SPWeb
// siteUrl, siteTitle, siteDescription, siteTemplate are parameters
SPWebCollection subsites = web.Webs;
SPWeb newWeb = subsites.Add(siteUrl, siteTitle, siteDescription, web.RegionalSettings.LocaleId, siteTemplate, UseUniquePermissions, false);

3. When users try to work with the new site, they often receive an error: "No connection could be made because the target machine actively refused it".

4. Upon investigation in ULS, I have found that the underlying error is "No available sandboxed code execution server could be found".

5. I made sure that the Microsoft SharePoint Server Sandboxed Code Service was running. I also tried both options in Central Admin / Sandbox Solution Management: "All sandboxed code runs on the same machine as a request" and "Requests to run sandboxed code are routed by solution affinity" with no avail.

Any idea what might be wrong?

Thanks,

Leszek

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