RoboTask forum

Hey,

Having a new issue where one of our SFTP connections are failing.

E: 11/4/2025 1:30:44 PM: Can't open SFTP session
E: 11/4/2025 1:30:44 PM: FATAL ERROR: Couldn't agree a client-to-server cipher (available: aes128-gcm@openssh.com,aes256-gcm@openssh.com)

It happens a few times throughout the day and other times during the day there are no issues.

I created a putty profile and moved some of the other ciphers down to warn below but it doesn't seem to help. Am I not doing it right or is there something else I can do different? I included a screenshot of the putty config for the ciphers and then a pic to show that the SFTP connection has the profile selected

Try to update PSFTP.EXE module.
We are currently using PSFTP.EXE version 0.76 in installation package.
The PUTTY package is now at version 0.83, released on 2025-02-08 (see here).
This may help.
In the next release, we will update PSFTP.EXE to the latest version.

Otherwise you need to reconfigure your SSH server. For example see here

I forgot to mention I did try that, I downloaded version .83, renamed the old one with .Old, and placed it in the C:\Program Files\RoboTask. After doing that none of my FTP connections worked.

The error message was a little different, this below.
I: 10/29/2025 8:28:10 PM: Executing "1.Create local variable "COMPANY" with value """
I: 10/29/2025 8:28:10 PM: Executing "2.Create local variable "FILENAMES" with value """
I: 10/29/2025 8:28:10 PM: Executing "3.SFTP Open ()"
E: 10/29/2025 8:29:10 PM: Can't open SFTP session
E: 10/29/2025 8:29:10 PM: Using username "usr".
E: 10/29/2025 8:29:10 PM: Keyboard-interactive authentication prompts from server:
E: 10/29/2025 8:29:10 PM:
E: 10/29/2025 8:29:10 PM: Timeout is over
E: 10/29/2025 8:29:10 PM: An error occurred. Step


Or is there something I needed to do differently?

I'm very sorry. The issue requires further investigation...

no problem, just wanted to make sure there wasn't anything else I needed to do. I downloaded some of the other version in-between the latest and what robotask has now and I am going to try those tonight, I will report back.

You can update PSFTP up to version 0.81 without any problems. I tested this, try it. All previous versions of PUTTY package are here
However, versions 0.82 and 0.83 (the latest) require a special approach.
We are trying to solve this problem.

Inform me about results

Thanks for the update, I didn't see your response but did try put .82 and .81, .81 ended up working. I did like 30 test connections, and it hasn't failed yet so hopefully thins continues to work. Thanks for your help.