Damn this just happened on one of my Linux installs and then shortly after a few minutes they all appear then disappear, and even when I start a new backup no live logging is possible when I choose any level when they are there.
Nov 07 11:10:29 maggie.mydomain.com duplicati-server[203684]: [WebSocket] Client closed connection prematurely.
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: fail: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[1]
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: An unhandled exception has occurred while executing the request.
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: System.NullReferenceException: Object reference not set to an instance of an object.
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Dto.LogEntry.FromInternalEntry(LogEntry entry)
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Endpoints.V1.LogData.<>c.<ExecuteLogPoll>b__1_0(LogEntry x)
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at System.Linq.Enumerable.SelectArrayIterator`2.Fill(ReadOnlySpan`1 source, Span`1 destination, Func`2 func)
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at System.Linq.Enumerable.SelectArrayIterator`2.ToArray()
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Endpoints.V1.LogData.ExecuteLogPoll(LogMessageType level, Int64 id, Int64 offset, Int32 pagesize)
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at lambda_method231(Closure, EndpointFilterInvocationContext)
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Middlewares.HostnameFilter.InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Middlewares.LanguageFilter.InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Microsoft.AspNetCore.Http.RequestDelegateFactory.<ExecuteValueTaskOfObject>g__ExecuteAwaited|129_0(ValueTask`1 valueTask, HttpContext httpContext, JsonTypeI>
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Middlewares.WebsocketExtensions.<>c__DisplayClass0_0.<<UseNotifications>b__0>d.MoveNext()
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: --- End of stack trace from previous location ---
Nov 07 11:12:43 maggie.mydomain.com duplicati-server[203684]: at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.<Invoke>g__Awaited|10_0(ExceptionHandlerMiddlewareImpl middleware, HttpContext context, Task>
Nov 07 11:14:14 maggie.mydomain.com duplicati-server[203684]: [WebSocket] Client closed connection prematurely.
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: fail: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[1]
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: An unhandled exception has occurred while executing the request.
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: System.NullReferenceException: Object reference not set to an instance of an object.
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Dto.LogEntry.FromInternalEntry(LogEntry entry)
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Endpoints.V1.LogData.<>c.<ExecuteLogPoll>b__1_0(LogEntry x)
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at System.Linq.Enumerable.SelectArrayIterator`2.Fill(ReadOnlySpan`1 source, Span`1 destination, Func`2 func)
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at System.Linq.Enumerable.SelectArrayIterator`2.ToArray()
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Endpoints.V1.LogData.ExecuteLogPoll(LogMessageType level, Int64 id, Int64 offset, Int32 pagesize)
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at lambda_method231(Closure, EndpointFilterInvocationContext)
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Middlewares.HostnameFilter.InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Middlewares.LanguageFilter.InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Microsoft.AspNetCore.Http.RequestDelegateFactory.<ExecuteValueTaskOfObject>g__ExecuteAwaited|129_0(ValueTask`1 valueTask, HttpContext httpContext, JsonTypeI>
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Duplicati.WebserverCore.Middlewares.WebsocketExtensions.<>c__DisplayClass0_0.<<UseNotifications>b__0>d.MoveNext()
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: --- End of stack trace from previous location ---
Nov 07 11:15:41 maggie.mydomain.com duplicati-server[203684]: at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.<Invoke>g__Awaite