Duplicati cannot backup to SSH on Debian after remote server update (Algorithm negotiation fail)

Question

This issue may be relevant for other Duplicati users:

Duplicati is configured to backup via SSH on a Debian webserver. After this webserver was updated, the backup failed with the error message "Algorithm negotiation fail".

SFTP via FileZilla is still possible, using the same credentials.

Community · Accepted Answer · 2017-05-23 10:31:16Z

10

The problem is that "insecure" algorithms were disabled for SSH (in 2014/15): https://stackoverflow.com/a/26607212/336311

One possible solution may be to re-enable these algorithms (see link above). But if you cannot (or do not want to) mess around with the SSH configuration, there is a more simple solution:

Download psftp.exe form the PuTTY Download Page
In Duplicati select the "Duplicati Options" -> "SSH" and select the pdftp.exe as SFTP program.
Using the "Duplicati Assistant", edit your backup to use the external SFTP program.

It took me an hour to track this issue, so I created this "share your knowledge" question on Stack Overflow. Hope it helps someone.

edited May 23, 2017 at 10:31

CommunityBot

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answered May 2, 2015 at 20:42

BurninLeo

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