Try renewing the DHCP lease.
If you are having issues connecting to a Wi-Fi hotspot, like at an airport or coffee shop, try renewing your DHCP lease.
1. Tap Settings >> Wi-Fi Networks, then tap More Info icon next to the network.
2. In the DHCP panel, select the Renew Lease button.
Restart the browser and try to connect. If that doesn't work try this:
Try forgetting the network.
Sometimes it's possible to resolve iTouch/iPhone network issues by removing the network connection and letting the device recognize the network from scratch.
Follow the same steps above for opening network settings, but click "Forget Network" to delete the connection.
Wait for your iTouch to disconnect and then reconnect.
If that does not work, restart the iPod and try to connect again.