You may have to manually define the access point. Settings-Connection-Access Points-"Your network name"
Options-Edit-Advance Settings-IpV4 Settings:

I use:
Phone IP: 192.168.1.55
(Better check the IP in your computer that connects to this network and use a similar IP my comp is 192.168.1.51)
Subnet Mask: 255.255.255.0
Default gateway: 192.168.1.1
Primary DNS: 212.77.192.59
Secondary DNS: 212.77.192.60