Is there a command line switch to limit the amount of sessio

Is there a command line switch to limit the amount of sessions that a file transfer will open? I've got a script that's been running great for the past year or so but suddenly the company that I get it from is reporting that it's opening up 20-30 sessions and wreaking havoc on their servers. I haven't updated anything on my side of things (though I suspect someone at their company has).

Looking through the scripting guide I didn't see anything and a google search didn't show me anything. Did I miss it or is there not a switch to do this?

What protocol are you using? Anyway, with SFTP/SCP there's single connection only. With FTP there's single control connection and single data connection. There's nothing to limit.

(That's for scripting, in GUI, you can have more connections, when using background transfer queue)