WyBuild suddenly can't connect to SFTP server

Updated my server install to Ubuntu 20.4 and WyBuild can't connect to the server via SFTP anymore.

The error reads 'Couldn't connect to the remote server: Failed to establish the SSH session. Error code: -5

I can connect to that server with clients like WinSCP and Putty just fine.

Also, I can put files into the /updates directory directly with the sftp command in the terminal. So I think it's a wyBuild issue.

Maybe wyBuild is missing newer ciphers that would be present in Ubuntu 20.4?

From auth.log:

localost: Unable to negotiate with 47.185.92.149 port 51447: no matching key exchange method found. Their offer: diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 [preauth]

Yup.

The fix on Ubuntu 20.4 is to add the line

KexAlgorithms +diffie-hellman-group1-sha1

to both /etc/ssh/ssh_config and /etc/ssh/sshd_config

This link explains the problem:

https://www.ibm.com/support/pages/ibm-aix-various-ssh-problems-after-upgrading-openssh-7x

The next version of wyBuild will have improved ciphersuites to connect to more strict SSH servers.

I'm having this same problem.

Any update on this ? Cant connect to FTP with SSL.

FTP with SSL is not a standard. SSH is.

If it has option for FTP with SSL, it wouldn't be bad, might as well make the software better.

FTP is a dead technology. It's been covered in this forum. SSH is the preferred open-standard file-upload method.

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