# Where does fingerprint come from with SFTP (SSH)?

**URL:** https://forum.duplicati.com/t/where-does-fingerprint-come-from-with-sftp-ssh/11031
**Category:** Support
**Created:** [October 30, 2020, 2:46am UTC](https://forum.duplicati.com/t/where-does-fingerprint-come-from-with-sftp-ssh/11031 "2020-10-30T02:46:48Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![ts678](https://forum.duplicati.com/letter_avatar_proxy/v4/letter/t/8491ac/32.png) [@ts678](https://forum.duplicati.com/u/ts678)
#### Post date: [October 30, 2020, 9:43pm UTC](https://forum.duplicati.com/t/where-does-fingerprint-come-from-with-sftp-ssh/11031/4 "2020-10-30T21:43:41Z")

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> [@bcsteeve](#):
>
> I’m curious what system you’re using, because there’s no “blue popup” when I hit test connection?!?

I’m using a Windows system that does not already have SSH fingerprint. If you have that, try deleting it, however if you have none too, and it says nothing on `Test connection` or backup, that seems strange.

Have you looked in `Destination` screen Advanced options or [Export As Command-line](https://duplicati.readthedocs.io/en/latest/03-using-the-graphical-user-interface/#exporting-a-backup-job-configuration) for fingerprint?

> [@bcsteeve](#):
>
> I’ve pulled md5 fingerprints

How does MD5 (obsolete and insecure) enter in, and what does “pulled” mean? This isn’t a file hash.

> [@bcsteeve](#):
>
> Because I’m using Docker container, is it based on some internal-to-the-image id somehow?!?

If you mean Duplicati Docker, which one (Duplicati or someone else’s). Or is sshd in a container?

Regardless, I don’t use Docker, so I can’t get into details, but don’t keep data in the container itself.

> [@Keep getting System.AggregateException and System.IO.FileNotFoundException. Need help](https://forum.duplicati.com/t/keep-getting-system-aggregateexception-and-system-io-filenotfoundexception-need-help/10826/12):
>
> > [@Keep getting System.AggregateException and System.IO.FileNotFoundException. Need help](https://forum.duplicati.com/t/keep-getting-system-aggregateexception-and-system-io-filenotfoundexception-need-help/10826/11):
> >
> > Can it be that linuxserver/duplicati uses /config and duplicati/duplicati uses /data? I had mounted /config, not /data.
> 
> Yeah, the two docker images are quite different in where they place data. Personally I would stick with the official image but you’ll definitely need to update your mappings if you haven’t done so already.

EDIT:

In addition to (and in basic agreement with) the earlier link I posted, here’s a recipe for getting fingerprints:

[About the SSH host key fingerprint](https://docs.bmc.com/docs/display/itda27/About+the+SSH+host+key+fingerprint)

Although I doubt it’s the case, if Duplicati Docker comes with a preinstalled ssh-fingeprint, that’d be a bug. Docker for the sshd side seems potentially likely to use the same /etc/ssh files, so may be prone to this…

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