O-dog, Yil, I've discovered the problem isn't ioftpd related as other software using the external IP has stopped working also (FTP Client and VNC). Therefore the problem lies within the new modem/router my ISP has provided me with. I assume the problem is caused by it's configuration which according to the ISP cannot be altered. Tried putting the PC in the DMZ but to no avail. Only option left is to disable the bnc checker
unless you have any other ideas ?