Email report: Error 55


My backups worked well on my previous Raspberry. I exported the configurations and imported them on my new Raspberry, which has exactly the same setup. The backups still seem to work well, Duplicati logs show 0 errors/warnings on the web UI, but I’ve configured it to send me a mail in cas of “Warning, Error, Fatal” and I do receive a mail for all of them, stating:

Failed: Error 55
Details: System.IO.IOException: Error 55
  at System.IO.__Error.WinIOError (System.Int32 errorCode, System.String maybeFullPath) [0x00219] in <254335e8c4aa42e3923a8ba0d5ce8650>:0 
  at System.IO.FileSystemInfo.get_Attributes () [0x00023] in <254335e8c4aa42e3923a8ba0d5ce8650>:0 
  at (wrapper remoting-invoke-with-check) System.IO.FileSystemInfo.get_Attributes()
  at Duplicati.Library.Main.Controller.ExpandInputSources (System.String[] inputsources, Duplicati.Library.Utility.IFilter filter) [0x0024d] in <8f1de655bd1240739a78684d845cecc8>:0 
  at Duplicati.Library.Main.Controller+<>c__DisplayClass14_0.<Backup>b__0 (Duplicati.Library.Main.BackupResults result) [0x0001d] in <8f1de655bd1240739a78684d845cecc8>:0 
  at Duplicati.Library.Main.Controller.RunAction[T] (T result, System.String[]& paths, Duplicati.Library.Utility.IFilter& filter, System.Action`1[T] method) [0x0011c] in <8f1de655bd1240739a78684d845cecc8>:0

I can’t find what is this “Error55”, could you help me understand it?

Welcome to the forum @Alomon

Handling I/O errors in .NET describes how there’s some error mapping required, but I suspect 55 is:

System Error Codes (0-499)


    55 (0x37)

    The specified network resource or device is no longer available.

Check your sources. Easiest way to see them might be in Commandline Commandline arguments.

Thanks for your answer which actually helped me to understand. My previous Raspberry was still plugged in and alive, Duplicati working on it but its source unplugged (moved to the new one). The error mail was sent by that instance. Thank you!

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