Hi After a lot of scratching around, a few posts here, I think I have cracked this issue and am posting here for the benefit of others.
When I started with this issue, I read i needed to change the value of C4 in /etc/e-smith/templates/var/service/ftp/peers/local/ConcurrencyPerIP to C8 or higher.
Another file in the same sort of location exists called: /etc/e-smith/templates/var/service/ftp/peers/0/ConcurrencyPerIP
Very similar with content but serves different purposes. The one you need to change is this one:
/etc/e-smith/templates/var/service/ftp/peers/0/ConcurrencyPerIP
Here is the steps I followed and It seems to work fine:
mkdir -p /etc/e-smith/templates-custom/var/service/ftp/peers/0
cp /etc/e-smith/templates/var/service/ftp/peers/0/ConcurrencyPerIP /etc/e-smith/templates-custom/var/service/ftp/peers/0
edit /etc/e-smith/templates-custom/var/service/ftp/peers/0 and change value to C8 or as I have to C16
expand-template /var/service/ftp/peers/0
service ftp restart
See if the concurrency issue is sorted.
Kobus