Excatly d1.
found another bug:
530 Login failed: Maximum concurrent connections for single host reached.
Even tho host.rules is ok and ppl should not be blocked.
Atvually i commented out all but:
# Default policy
#
# POLICY ACCEPT CONNECTIONS_PER_IP
# POLICY DENY
#
POLICY ACCEPT 5
When using an entry bnc, it seems like ioFTPD thinks all connected users are from same ip.
At least thats my theory