ASP.NET CORE WEB API Microsoft.Data.sqlclient.sqlexception (0x80131904):

"ConnectionStrings": {
    "DefaultConnection": "Server=192.168.1.XXX\\SQL2012; Initial Catalog=IBCOREDB_XXX; User ID=XXXX;Password=XXXXX;",
  },

// check the connectionString if it's correct sometimes it can lead to an connect error
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