The netword is blocking encrypted dns traffic ????what that mean how can i fix it ??

If you use Public Wi-Fi, see this Apple article: Use captive Wi-Fi networks on your iPhone, iPad or iPod touch

https://support.apple.com/en-gb/HT204497

If you use your Home Wi-Fi network, try this:

Disabled Privacy Address.

Forgot this network.

Rejoined that network while submitting a password.

See the following Apple articles:

Connect to Wi-Fi on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT202639

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

https://support.apple.com/en-us/HT204051