Knowledge Base

Enter search queries below or use the tag links to the right to browse the knowledge base by category (Show All Tags).

What does "SSL protocol error" mean when connecting to an FTPS server?

Robo-FTP may report an "SSL protocol error" when it is unable to negotiate a secure connection with the remote server. This may happen when the server requires a client certificate for user authentication. The administrator of the remote server should be able to confirm if a certificate is required.

In Robo-FTP 3.8 and earlier this message was printed in the Trace Log, often with a reason code of 60000. In Robo-FTP 3.9 the "SSL protocol error" message also appears in the main console and Script Log.

Note: Some HTTPS servers also require client certificates for user authentication.

Article last updated: 2021-01-06

Tags: Robo-FTP, SSL, protocol error, 60000