I also found a few connection issues after which the mentioned KyeNotFoundException started to occur. I guess this somehow messed up everything.
May 5 06:21:28 dotnet: Nop.Web Error: 0 :
May 5 06:21:28 dotnet: System.IO.IOException: Unable to write data to the transport connection: Broken pipe.#012 ---> System.Net.Sockets.SocketException (32): Broken pipe#012 at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)#012 --- End of inner exception stack trace ---#012 at System.Net.Sockets.NetworkStream.Write(Byte[] buffer, Int32 offset, Int32 size)#012 at System.Net.Security.SslStream.WriteSingleChunk[TWriteAdapter](TWriteAdapter writeAdapter, ReadOnlyMemory`1 buffer)#012 at System.Net.Security.SslStream.WriteAsyncInternal[TWriteAdapter](TWriteAdapter writeAdapter, ReadOnlyMemory`1 buffer)#012 at System.Net.Security.SslStream.Write(Byte[] buffer, Int32 offset, Int32 count)#012 at MySql.Data.MySqlClient.TimedStream.Write(Byte[] buffer, Int32 offset, Int32 count)#012 at MySql.Data.MySqlClient.MySqlStream.SendPacket(MySqlPacket packet)#012 at MySql.Data.MySqlClient.NativeDriver.ExecutePacket(MySqlPacket packetToExecute)#012 at MySql.Data.MySqlClient.NativeDriver.Close(Boolean isOpen)
May 5 06:21:28 dotnet: Nop.Web Error: 0 :
May 5 06:21:28 dotnet: Unable to connect to any of the specified MySQL hosts.
May 5 06:21:28 #033[41m#033[30mfail#033[39m#033[22m#033[49m: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[1]
May 5 06:21:28 An unhandled exception has occurred while executing the request.
May 5 06:21:28 Autofac.Core.DependencyResolutionException: An exception was thrown while activating Nop.Web.Framework.WebWorkContext -> Nop.Services.Directory.CurrencyService -> Nop.Services.Directory.ExchangeRatePluginManager -> Nop.Services.Plugins.PluginService -> Nop.Data.Migrations.MigrationManager -> λ:FluentMigrator.Runner.IVersionLoader.
May 5 06:21:28 ---> MySql.Data.MySqlClient.MySqlException (0x80004005): Unable to connect to any of the specified MySQL hosts.
May 5 06:21:28 ---> System.AggregateException: One or more errors occurred. (Connection refused xx.xxx.xxx.xxx:3306)
May 5 06:21:28 ---> System.Net.Internals.SocketExceptionFactory+ExtendedSocketException (111): Connection refused xx.xxx.xxx.xxx:3306
May 5 06:21:28 at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
May 5 06:21:28 at System.Net.Sockets.TcpClient.EndConnect(IAsyncResult asyncResult)
May 5 06:21:28 at System.Threading.Tasks.TaskFactory`1.FromAsyncCoreLogic(IAsyncResult iar, Func`2 endFunction, Action`1 endAction, Task`1 promise, Boolean requiresSynchronization)