Bug reports without an attached log file are usually useless.
No, it's not possible. And It does not indeed make a little sense.
For a SFTP connection,
This makes not so much sense for me but my customer want to use as few ports as possible and this is mandatory.
Not only for the source port of the server but also for the source ports of the client.
Re: Using specific source port-range in WinSCP
Port of which connection? Why?
Using specific source port-range in WinSCP
How can I restrict client source ports in WinSCP?