Support

Need a hand with sFTP Pro?

Last updated: 6 September 2026

Before you write

Three situations account for most of the messages, and all three have an answer already.

The server refuses my RSA key

sFTP Pro signs with the historical ssh-rsa algorithm, which OpenSSH 8.8 and later reject by default. Generate an ed25519 key instead — it is the modern default and works everywhere:

ssh-keygen -t ed25519, then copy the public key to the server with ssh-copy-id.

My password is refused even though it is right

Some servers only accept keyboard-interactive authentication, which is not supported yet. The log at the bottom of the file browser says which methods the server accepts. Connecting with a key is the way around it.

The app says the host key changed

That warning means the server presented a different identity than the one you approved before. It happens legitimately after a server rebuild or a hosting migration — but it is also what an interception looks like. Check with whoever runs the server before accepting.

The App Store version asks for a folder

The version distributed through the Mac App Store runs in Apple's sandbox, so it can only read folders you point it to. The first time, choose the folder you transfer files from — your home folder, or the folder of the site you work on — and it will be remembered from then on.

For the same reason, reusing the hosts you already approved in Terminal requires granting access to your .ssh folder once, from Preferences → Accesses.

Reporting a problem

To make a report useful, include:

• the app version, from Preferences → General → Info & Support;
• your macOS version;
• the protocol and, if you know it, the server software;
• the contents of the Log tab in the file browser, which records every command sent and every answer received. Remove anything you would rather not share.