aes256-ctr for SFTP requests

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Posted on by DwayneL3e

Hello, I want to use SFTP but I can't and get this error.

Korrelations-ID: 37d42b22-f9bb-4e6f-9f4b-5a**********

cipher name aes256-ctr for openssh key file is not supported: Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK.ActionException: unable to connect to **.**.**.***. ---> Renci.SshNet.Common.SshException: cipher name aes256-ctr for openssh key file is not supported
at Renci.SshNet.PrivateKeyFile.ParseOpenSshV1Key(Byte[] keyFileData, String passPhrase)
at Renci.SshNet.PrivateKeyFile.Open(Stream privateKey, String passPhrase)
at Renci.SshNet.PrivateKeyFile..ctor(String fileName, String passPhrase)
at Microsoft.Flow.RPA.Desktop.Modules.FTP.Actions.OpenSecureFtpConnectionAction.InitializeSftpConnection()
at Microsoft.Flow.RPA.Desktop.Modules.FTP.Actions.OpenSecureFtpConnectionAction.Execute(ActionContext context)
--- End of internal exception stack monitoring ---
at Microsoft.Flow.RPA.Desktop.Modules.FTP.Actions.OpenSecureFtpConnectionAction.Execute(ActionContext context)
at Microsoft.Flow.RPA.Desktop.Robin.Engine.Execution.ActionRunner.Run(IActionStatement statement, Dictionary`2 inputArguments, Dictionary`2 outputArguments)

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Power Automate Desktop

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Srini007 3,490 Super User 2026 Season 1 on at

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Hi @DwayneL3e

It's very minimal information to understand the issue, better you share some screenshots or some explaination which action you are trying and what issue you are facing

Regards,

Srini
DwayneL3e 4 on at

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What do you mean it's very little information it literally says whats wrong in the Stacktrace and I am wondering why its not supported since its like a industry standard
Srini007 3,490 Super User 2026 Season 1 on at

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Hi @DwayneL3e

Now the details are clear, because from the previous post we can see the error stack but don't know what parameters you are passing causing the error

So, just want to recheck with you that in the path of key file can you type entire path of the keypath with file extenstion? may be aaa.txt or something and try?

If you find this reply helpful, please consider giving it a LIKE AND

If this reply answers your question or solves your issue, please ACCEPT AS SOLUTION

Thanks,

Srini
DwayneL3e 4 on at

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You really are the most pathetic person I've met in a long time, you don't even try to help or think, you just try to be the BEST in a ranking. You see in the error that he recognizes from the key that it is aes256 how should the path be wrong?
yoko2020 495 on at

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It is clear cipher name aes256-ctr for openssh key file is not supported.

Read this link for solution https://github.com/sshnet/SSH.NET/issues/742#issuecomment-1292945883