I have been experiencing problems with zonealarm pro 3.0.118 and xolox 1.21..... I am running windows 98.... it seems that there is an incompatibility between xolox and zonealarm... whether this is due to windows 98 I am not sure, however there is a way around it - simply shut down zone alarm, connect with xolox and then fire up the firewall (xolox just hangs if you try and run it with zonealarm already running)....

apologies if this rudimentary solution has been mentioned elsewhere....