To summarize, you're trying to use Chilkat to connect to an SFTP server - is that correct? If so:
- Are you able to connect using other clients, but not with Chilkat, or
- You're not able to connect to that server with anything?

Some possibilities, not specific to Chilkat:

- Does the SFTP server have source IP restrictions? I've encountered some which will only accept connections from a list of approved IP addresses
- If you're using private/public key pairs, does your public key need to be registered with the SFTP server so it will allow connections from you i.e. you send them your public key in advance? Alternately, maybe in their scenario it's necessary for them to generate a key pair for you, register your public key, then send you your private key using some secure transfer method

>Yes, I tried the different types with the different methods for loading a key-file, keys generated with puttygen, sshkey and openssh. But by now, all different methods have failed.
>Best regards
>Thomas
>
>>Hi there,
>>is there anybody who has used chilkat for SFTP-Transfer using key-authentication?
>>I tried using ssh-keygen generated key-pairs, also in openssh-format and puTTYgen-keys. All without any success. I can check some of them by using the Rebex Tiny-SFTP-Server and Filezilla but when I try to load a key with Chilkat (9.5.0.77) it fails.
>>Can someone point me the right direction?
>>Thanks in advance
>>Thomas
>
>I had it running for years to a customer site. The key file was given to us by the company whose site we were hitting.
>
>I admit to cheating: I just follow the appropriate example on the Chilkat site. Note that the examples are different for the 2 types of keys you mention.
>
>Hank