Recently my Lumia 920 will not allow any wifi connections. I haven't changed any settings or did anything different with the phone, but when I try to connect it says "Your phone can not connect to the Wifi Network, try again later". I've turned the phone/wifi on and off several times and still nothing. What can I do?
This is a prevailing bug/conflict/issue with windows phone. I have experienced it a lot and resetting my router works most of the times. Second option would be restarting your handset. If either of the steps fails to connect, try changing WEP to WPA and vice versa in your router settings. If it is still unresolved, manually assign an IP address to your handset. Settings -> Wi-Fi -> static-ip.
As I stated The reason might be Static IP, which is a new feature introduced in the LUMIA CYAN update with windows phone 8.1.
So you will have to turn off static IP, possibly if the settings does not match the particular default gateway your are trying to connect.
You can find the detailed description in the links given. The blog has some more reasons mentioned in the article, but mainly this is the major issues concerned with the phone, other reasons are related to router and internet.