I’m trying to use the FTP Scope activity (UiPath.FTP.Activities.WithFtpSession) and I’m getting a “FTP Scope: Server HMAC algorithm not found” when trying to connect to the server via user and (secure)password.
Some of my setup variable values are:
I can connect to the SFTP server with this protocol with my credentials without any problem and without any specific, special set up.
I suppose you can connect using another SFTP client software.
Therefore I would recommend to check what HMAC protocol is used by the SFTP client to establish the connection. It should be one for followings supported by FTP.Activities package:
The client I’m using is WinSCP. With WinSCP /info I get a list of the ciphers and algorithms supported by the program. The ones that look more similar to me to the “HMAC protocol” are the “SSH MAC algorithms”:
The “FTP Scope: Server HMAC algorithm not found” error typically occurs when the FTP server uses a cryptographic algorithm that is not supported by the FTP activity in UiPath. This error can happen if the server is using a specific HMAC (Hash-based Message Authentication Code) algorithm that is not supported by the FTP activity.
To resolve this issue, you can try the following steps:
Update the FTP activity package: Ensure that you are using the latest version of the FTP activity package in UiPath Studio. Check for any available updates and install them if necessary. Sometimes, newer versions of the package may include support for additional HMAC algorithms.
Check FTP server settings: Verify the HMAC algorithm used by the FTP server. Contact the server administrator or review the server documentation to determine which HMAC algorithms are supported. Ensure that the server is using a supported algorithm.
Adjust FTP activity settings: If the FTP server supports multiple HMAC algorithms, you can try adjusting the FTP activity settings to use a specific algorithm. In the FTP Scope activity, look for properties related to HMAC algorithms or security settings. Experiment with different settings or consult the activity documentation to find the appropriate configuration for your server.
Use a different FTP activity: If the above steps do not resolve the issue, you can try using a different FTP activity package that supports the HMAC algorithm used by your server. There are alternative FTP activity packages available in UiPath ecosystem that may offer broader support for different protocols and algorithms.
If none of the above steps resolve the issue, it may be necessary to reach out to UiPath support or the FTP activity package developer for further assistance. They can provide guidance and potentially address any compatibility issues or limitations with the specific FTP server you are connecting to.
Remember to review the FTP activity documentation and consult with your IT team or server administrator to ensure that the connection settings and security protocols are correctly configured for your specific server environment.
None of the solutions you suggested worked. According to @J0ska’s reply, the activity supports whatever HMAC algorithm the server is using.
No HMAC-related settings are available in the activity properties. Sorry to bother, but better not suggesting something that in advance is not possible. Furthermore, I already checked the “Accept All Certificates” option, the “Use SFTP” one, FTPS Mode is set to “None”, as well as SSL Protocols…
I’m reluctant to try any of the other available SFTP related activities as are provided by third-party developers…
Regarding updating SSH.NET and FluentFTP packages… Well, when I search for them, I find out that I don’t have them installed, so in my case it would imply installing them, not updating. I don’t understand the underlying mechanism. If they are dependencies for FTP Activities, how is it that I don’t have them installed? Are you sure this is going to make a difference?
Regarding integrating WinSCP:
In fact that is how our application currently works. And we wanted to switch to a more “compact” solution since we are using authentication via password and having to type it in via the robot each time slows down the process and make thinks more prone to error…
This is so frustrating. I tried using another SFTP activity (SFTP.Activities), just to realize that it throws exactly the same “Server HMAC algorithm not found” (probably because it has tha same SSH.net dependency).
Then there’s this NovigoSolutions.SFTP.Activities, which I couldn’t try because it doesn’t work with a password but just a key file, but also displays the same dependency, and there’s a another package I installed but don’t show any related activity available (I don’t understand why): “FluentFTP” (doesn’t show any dependency).
SSH.NET is installed automatically as deppendency of FTP.Activities. You could try to download the later version from nuget.org and FTP.Activities should use it. But based on information in github I am not sure it will solve the problem
How did you integrate WinSCP? Via Powershell or via .NET library?