I have some users who have reported connection problem with the wi-fi network. The network configurations are very different and for understand the issue I need to know some information like the hardware (mac or pc) the OS (windows XP, Vista, Mac OSX) and also, if you can, the type of network (example router at home, access point public or at work etc).
I have a little suggestion: verify that the IP address shown for the iPhone is the same that you have in the iPhone configuration. You can find your IP address going to Settings > Wi-Fi > 'your network' > DHCP see the IP Address (something like 192.168.x.x)
Insert http://ipaddress:8080 in your browser witht :8080 at the end. For example if the address are 192.168.1.5 insert in the web browser
I have found a bug in version 1.3 that in some case can hang the app when a is recipe is sended. I think to release a fix in short time.