iOS 15.4.1 Wi Fi problem

Fix for me:

Settings -> Wifi -> i (next to the network name) -> Configure DNS -> Manual

* Remove router's ip (192.168.0.1 in my case)

* Added Google's DNS server: 8.8.8.8

VPN was not the issue (perhaps it is for some). After the iOS update, my phone couldn't use my router for DNS (other devices and computers work w/o any issues). This appears to be an Apple incompatibility introduced w/ the last update.

You may want to replace 8.8.8.8 with your ISP's DNS servers.

jigneshkhatri wrote:

Have a similar issue with the WiFi with iPhone 12 mini after updating to 15.4.1. WiFi gets connected but shows a slow connection with a few apps, but the WiFi connection isn't actually slow.

Are you using VPN? It typically reduces speed by 1/2 or worse.

jigneshkhatri wrote:

Nope, not using VPN (had never installed/used that on this iPhone). Also, there is no firewall. WiFi Internet works seamlessly with my laptops.

This was the same for my iPhone 12 Pro, my daughter's, and my AppleTV (which also updated to 15.4.1). I solved this by doing the following:

Settings -> Wifi -> i (next to the network name) -> Configure DNS -> Manual

* Remove router's ip (192.168.0.1 in my case)

* Added Google's DNS server: 8.8.8.8

My MBP M1 Max did not need to do this. Clearly an iOS change broke something.

I am having similar issues. I tried to network reset, airplane mode, soft reset... after the first reset i was able to achieve 120 up 3 down... but has degraded seriously immediately after that consistently getting < 10 down and 10 up. What gives?!

Since ios 15.4.1 and now 15.5 the issue still happens. Iphone 12 pro max and an iphone 13 pro max, but iphone se 2020 is ok.

The problem is the wifi system of the router (i think the Airtime Fairness technology ( it managers devices without connection —-> example : iphone blocked without using)

The issue is not present on old routers.

I start having problem with my network settings too once iOS was updated to 15.4.1. It keeps saying no connection on wifi yet I cannot switch off the wifi function itself, and will have to resort in restarting the phone every single time. My friend has the same exact issues even with different iPhone series but same iOS.

Issue solved : buy a Huawei router witch wifi6, wait for some hours (my case more than one day) and the issue disappears, no more disconnections (more than a week without problems and wifi 6 is highly recommended)

Possible cause : 1) low and unstable wifi potencial from your internet (ISP). iPhone PRO MAXs have something disconnects from lower signal (when the iPhone is blocked essentially).

2) Apple try to load automatically a WIFI spot you recorded from another site (example your parents' home) and what try to connect the wifi password is your wifi password (it's the other). I know you consider me mad, but I noticed that wifi password in my IMAC, MacBook Pro , and iPhones, connects automatically without my effort (from the iCloud maybe) when wifi password is sharing between the devices.

So, you'd better erase all your wifi's password saved, connect new Huawei or Linksys router and voila.

NOTE : issue for me is since ios15.4 (march 2022) on iPhone 12 Pro Max and 13 Pro Max.

I also have this problem within iOS 15.4.1. It says my wifi has no internet connection, but then i can fully use the wifi on my macbook pro. Definitely wrong within the iOS itself. **** it apple

This is in no way any solution to the problem. It is generated by the update. Just updated my daughters iPhone 11 Pro this morning, and now she experiences the same issue.

iOS 15.4.1 is the issue

also facing the same issue. its ridiculous, after updsting new software hotspot is not working.

There is a problem - cell connectivity is also less reliable. Please diagnose and issue a fix. It is 100% 15.4.1 related.

it makes no difference. I use a vpn, my daughter doesn’t..

and indeed, cell connectivity is less consistent too.

Have you restarted your router?

have you deleted your VPN app and profile if you have one?

Please restart the router. It should be done regularly, anyway.

When I got done with the update, now I can’t turn on the WiFi. It comes up in settings but is Grayed out how to fix?!