WI-FI is not working (Incorrect password)

This usually happens when you move from one wifi network to another. Especially from enterprise wifi network to home wifi. You may try this process given below. There could be conflict of IP address between the Wifi at your Home and at the place where you had just been because DHCP assigns IP addresses from its pool.

Managing Your IP Addresses With DHCP

DHCP, which manages all the IP addresses on your network, is typically enabled by default on most consumer routers. The router uses the IP Address, a numeric identifier, to locate your device and route the correct network traffic.

If the computer or mobile device does not already have an IP address, it will request one from the network's DHCP server, which is on the router. The DHCP server pulls an IP address from a pool of available IP addresses (called a Scope) and assigns it to the device. When the device disconnects from the network, or a certain amount of time has passed before reconnection (referred to as a lease) the IP address returns to the DHCP pool.

Certain devices, such as servers and printers, need to always have the same IP address. They can't have their addresses change periodically. If you are in that situation, you need to assign a static IP address, an IP address that never goes in the DHCP pool and is assigned to the device permanently. To make static IP addresses available, we exclude some IP addresses from the DHCP scope so they can be assigned manually.

To set the DHCP scope, follow these steps:

• Log in to the router's management console and look for a heading like LAN Setup (or something similar). Here you should see your LAN's IP address and subnet mask, along with a section for the DHCP server.
• Assign a range of IP addresses for the DHCP server to use. Assuming your router's IP address is 192.168.0.1 and you wanted to assign 50 IP addresses to the DHCP scope, you would set the Starting IP address to 192.168.0.51 and the Ending address to 192.168.0.100. (Just an example)

(This is different from the Static IP address provided by your ISP)

There might be a few WPA2 options listed, but you want the one listed as WPA2-PSK [AES]. This is the highest level of wireless security currently available. Some routers still offer WEP. Do not use it, as it is vulnerable to brute-force attacks.

Try these steps:

1: Reboot the iPhone.

2: Forget the Wi-Fi Network, then Re-Join.

3: Reset iOS Network Settings on the iPhone.

4: Restart the Wi-Fi Router or Modem.