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Connection from mainframe ended by Core FTP server: Reason 2: connection type not allowed

Posted: Wed May 09, 2018 9:21 pm
by dennisjm
I have a client running on an IBM mainframe that is trying to connect to a Core FTP server for the first time.
Debug output on the mainframe shows this version information for the Core FTP server: SSH-2.0-CoreFTP-0.3.3.
Debugging shows authentication was successful, a session channel was open, then the client sent a sftp subsystem request.
The Core FTP server disconnected with the client logging this message:
Reason 2: connection type not allowed

Does that reason indicate the Core FTP server is not configured to handle sftp connections from that client?
Which areas on the Core FTP server should I check? Site Manager? Connect Manager?

Are there any diagnostics on the Core FTP server which can provide more information on why the server disconnected?

Re: Connection from mainframe ended by Core FTP server: Reason 2: connection type not allowed

Posted: Fri May 11, 2018 5:49 pm
by ForumAdmin
the only subsystem type allowed is 'sftp'. All other connection types will be rejected. Good chance the client is requesting a shell session.