Incompatible if more than a single connection is used, dependent on FTP server

[OPTIAIR]

V2.3 1993 seems to crash if more than a single connection is use against some servers.
It hangs on this screen for 5 download if I use 2 connections per host.
Xfering
Connecting
Pending
Pending
Pending

Single Connection, = OK
One per Host = OK
Multiple for each transfer = OK
the rest fails...
Maybe the Serv-U FTP server does not allow more the one connection... , it works with CrushFTP

[ForumAdmin]

Some servers will not allow multiple connections (or can't handle it in some cases).

If you post the full log there might be more information that helps diagnose the issue.

Better to always start with one connection, then work up from there.