not sure what you mean security says none, but whatever the case, I also had a lot of trouble connecting to WiFi after we got a new modem & router from Comcast (our cable company), although we connected just fine to the old equipment. We got new equip. all set up & had the WiFi working properly on our laptops, but when trying to connect to WiFi on our phones, we'd enter the password, & then it would say "saved, secured" but it did not say "connected" like it should. We went in circles for hours trying to find a way to connect, & finally I noticed that under the advanced settings (on our phones) for the network/WiFi connection, it showed a Mac address, but the IP address was either blank or said "unavailable" (or something like that.) Since we weren't on any kind of Mac device, this seemed it had to be the source of the problem, & it was. The bad news is that I have no idea what actually fixed it. We tried resetting the modem/router a time or 2, & also tried restarting our phones, but neither fixed the problem. However, eventually something fixed it & once fixed, I could then see an IP address assigned where there was none before. So, perhaps that is something you could check, but I don't know exactly the cause or the solution =(
