Hello Sorin, Could you please let me know about the project that you upgrade the project or you had build in version 13 ??

I have exactly the same problem running v13.0.3. Working in both my development env and in Azure but deployed to IIS I get this error.

even i am getting the same error where i have web.config as follows. I am using sql db with umbraco version 13.1.1 and throws the same error i also tries to implement with sqlite db still error was same while deploying in iis server.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <location path="." inheritInChildApplications="false">
    <system.webServer>
      <handlers>
        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
      </handlers>
      <aspNetCore processPath="dotnet" arguments=".\sqlDemo.dll" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" hostingModel="inprocess" >
      <environmentVariables>
        <environmentVariable name="ASPNETCORE_ENVIRONMENT" value="Development" />
      </environmentVariables>
      </aspNetCore>
    </system.webServer>
  </location>
</configuration>

I'm getting a similar error too. I searched all over the internet but couldn't find anything. I am using Umbraco version 13.2.2. Please can you help?

TimeoutException: Cannot acquire MainDom
Umbraco.Cms.Core.Runtime.MainDom.Acquire()
Umbraco.Cms.Core.Runtime.MainDom+<>c__DisplayClass12_0.<Acquire>b__0()
System.Threading.LazyInitializer.EnsureInitializedCore<T>(ref T target, ref bool initialized, ref object syncLock, Func<T> valueFactory)
System.Threading.LazyInitializer.EnsureInitialized<T>(ref T target, ref bool initialized, ref object syncLock, Func<T> valueFactory)
Umbraco.Cms.Core.Runtime.MainDom.Acquire(IApplicationShutdownRegistry hostingEnvironment)
Umbraco.Cms.Infrastructure.Runtime.CoreRuntime.AcquireMainDom()
Umbraco.Cms.Infrastructure.Runtime.CoreRuntime.StartAsync(CancellationToken cancellationToken, bool isRestarting)
Umbraco.Cms.Infrastructure.Runtime.CoreRuntime.StartAsync(CancellationToken cancellationToken)
Umbraco.Extensions.WebApplicationExtensions.BootUmbracoAsync(WebApplication app)
Program.<Main>$(string[] args) in Program.cs
Program.<Main>(string[] args)

I am running the exact same settup en getting the same error umbraco: 13.1.1 Db: SQLSERVEREXPRESS IIS: 10.0.19041.1

The site runs fine from Visual studio but when i publish to my win11 server this error popps up. I thought it might be an connection string issue butt no changes to the connection string affects the error in any way so i think it triggers before reaching out to the DB My publish settings are as follows

I figured out the issue. The IIS_IUSRS user is missing permissions folder where the files are located.

Refference: https://docs.umbraco.com/umbraco-cms/fundamentals/setup/server-setup/permissions I gave mine all permissions and it solved the issue

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