Can not login to server

It has been two months since I used SmartFTP. When I recently opened SmartFTP to do some file maintenance at a friends site I was informed that a newer version of SmartFTP was available. I downloaded and installed build 981. Now, I can not login to this server that I had successfully visited many times without fail.

This is what I am seeing in the connection box:

Connecting to (www.xxx.xxxx.xxx) -> IP: xxx.xx.xx.xxx PORT: 21
Connected to (www.xxx.xxxx.xxx) -> Time = 0ms
Socket connected waiting for login sequence.
Cannot login waiting to retry (30s)...

The login name and password I am using is correct and has been verified by the owner.

I use ZoneAlarm and have set SmartFTP as trusted. I have entered the server IP address as trusted. I have also disabled ZoneAlarm and had no better luck.

I am guessing that I am overlooking a setting in SmartFTP. Any suggestions?