Get Files from an SFTP Server
# umh-supportn
Nils
09/10/2026, 2:04 PMI try to collect sample files from a SFTP server into UMH. The handshake fails all the time because of mismatch in host key. What do i need to take care of when creating a bridge with SFTP? Do i need to create a .ssh directory inside the instance container or map it from the host system? Which host key do i need to paste in there? Does it also work automatically?
r
runeston3
09/11/2026, 7:49 AMhttps://docs.redpanda.com/connect/components/inputs/sftp/
paste the key in the config
n
Nils
09/11/2026, 8:21 AMWell that's obvious. I checked the host_key in the sshd_config and pasted the raw content of the key into the config. But there's still a mismatch. And also the sftp server allows user/password authentication so i assumed this is also possible because i provided username and password
Nils
09/14/2026, 1:05 PMre-applying config: ReadDFC: Input config differences:
- Input.sftp: exists in desired but missing in observed
Output config differences:
- Output.uns: exists in desired but missing in observed
Pipeline config differences:
And also: It fails for days already to get the bridge running. I don't really get what's the issue here. I redeployed it many times but still dont get whats the issue
Nils
09/14/2026, 1:25 PMservice closing due to: failed to init input path root.input: reading known_hosts file: open /home/umhuser/.ssh/known_hosts: no such file or directory
And also this is an obvious error as well. I had to create that directory manually but still it doesnt resolve the error. any ideas?
r
runeston3
09/14/2026, 4:52 PMDo you mind sharing the config? With removed credentials ofc. And also the logs
n
Nils
09/15/2026, 6:57 AMI don't.
Config:
sftp:
address:
auto_replay_nacks: true
credentials:
host_public_key: *
password: *
username: *
paths:
- /path
scanner:
to_the_end: {}
watcher:
cache: ""
enabled: true
minimum_age: 1s
poll_interval: 1s
Nils
09/15/2026, 7:00 AMr
runeston3
09/15/2026, 4:33 PMI do not have time to check this until earliest end of week, but i will get back to you unless one of my colleagues check it before me.
runeston3
09/20/2026, 8:05 AMi tested this now against a public sftp server. i wrote a guide how to use it.
runeston3
10/12/2026, 11:08 AMNow there is a bridge template for this and i made a blog article about this:
https://www.umh.app/insight/reading-files-from-sftp-into-the-uns-and-the-host-key-error-that-breaks-the-first-try
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