Problems with .NET SFTP connection and Host Key

Hi

Problem: When I try to log on autocratically using the dll I get the following error message: "Host key wasn't verified!". Manual log on works perfect.

What I've done:

Manually connected to the server and copied the key from Server/Protocol Information.

Written the following powershell script:
----------------------
$sftp_site = @{"HOST" = "X.X.X.X"; "LOCATION" = "/Elev/"; "USER" = "YYYY"; "PASSWORD" = "ZZZZ"; "PRIVATEKEYPATH" = "mykey.ppk"; "HOSTKEY" = "ssh-dss 1024 bf:1f:9c:5d:92:a5:dd:2d:b1:ce:e6:c1:20:73:32:71"}

# Load WinSCP .NET assembly
[Reflection.Assembly]::LoadFrom($winscp_path) | Out-Null

# Setup session options
$sessionOptions = New-Object WinSCP.SessionOptions
$sessionOptions.Protocol = [WinSCP.Protocol]::Sftp
$sessionOptions.HostName = $sftp_site["HOST"]
$sessionOptions.UserName = $sftp_site["USER"]
$sessionOptions.Password = $sftp_site["PASSWORD"]
$sessionOptions.SshHostKeyFingerprint = $sftp_site["HOSTKEY"]

$session = New-Object WinSCP.Session

try {
# Connect
$session.Open($sessionOptions)

# Upload files
$transferOptions = New-Object WinSCP.TransferOptions
$transferOptions.TransferMode = [WinSCP.TransferMode]::Binary

$transferResult = $session.PutFiles($work_directory + "*", $sftp_site["LOCATION"], $FALSE, $transferOptions)

# Throw on any error
$transferResult.Check()
}
finally {
# Disconnect, clean up
$session.Dispose()
}
------------------------

If I change the host key to an invalid value (deleting the last letter) I get an Regular Expression error - which shows that the Host key is being read.

What can I do to debug the problem?

After I read my post I can see I didn't use that much text.

If anyone would like to help but do not have enough information, please write and I'll try to gather all necessary information.

/Karsten Wagner Bang

You are most likely using from wrong key fingerprint.
Please set Session.SessionLogPath and check the fingerprints there. Attach the log here, if it does not help.

Dooohh - I feel stupid now.

What happened:
1: :D I added session logging.
2: :shock: I was puzzled as the host key was exactly the same key as for my other host.
3: :oops: I realized I'd been testing the script against the wrong IP - feeling quite stupid now.

Sorry for your trouble, and thanks for your help.
/Karsten Wagner Bang