umbraco could not connect to the database

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Ivan 1 post 71 karma points

May 03, 2023 @ 13:20

Hello, I'm running the API on localhost and getting this error:

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In logs I find:

    "Umbraco.Core.Exceptions.BootFailedException: A connection string is configured but Umbraco could not connect to the database.
      at Umbraco.Core.RuntimeState.DetermineRuntimeLevel(IUmbracoDatabaseFactory databaseFactory) in D:\\a\\1\\s\\src\\Umbraco.Core\\RuntimeState.cs:line 188
      at Umbraco.Core.Runtime.CoreRuntime.DetermineRuntimeLevel(IUmbracoDatabaseFactory databaseFactory, IProfilingLogger profilingLogger) in D:\\a\\1\\s\\src\\Umbraco.Core\\Runtime\\CoreRuntime.cs:line 375
      at Umbraco.Core.Runtime.CoreRuntime.Boot(IRegister register, DisposableTimer timer) in D:\\a\\1\\s\\src\\Umbraco.Core\\Runtime\\CoreRuntime.cs:line 179"

I haven't made any changes and it was working until yesterday and now I'm constantly getting this error. Using sql express and connection string is correct, I can connect to database through ssms.

I've been browsing through forum and tried suggested solutions but nothing helped. I've read that it may be caused by permissions in App_Data folder of project - I have this: