If network speed is less than 1kb/s then why SFTP connection fails more frequently

If network speed is less than 开发者_开发知识库1kb/s then why SFTP connection fails more frequently.

If i increase network speed then no sftp connection fails.

This sounds like a timeout problem. Your slower connection probably causes the SSH connection to reset. Try adding

ServerAliveInterval 60

in your ssh_config.

Consider also using an sftp client that can recover from broken connections as for instance lftp.