I have a Windows server set up for VPN connections. After configuring the settings, some iPhone devices can successfully connect to the VPN, but others, such as an iPhone 11 Pro Max.
The configurations in the images are in windows firewall inside ipsec settings
Does the iPhone 11 use the latest iOS? Or an older version?
Iphone 11 probably doesn’t support the new backdoors
I think I found the problem. My VPN is using the following settings: Cipher Algorithm: DES3, Hash Algorithm: SHA1, and Group ID: DH2. Older versions of iOS support these protocols natively, but newer versions do not. From the tests I’ve conducted, it seems that Apple now requires Cipher: AES256 and Group ID: DH14. I need to find a way to support both handshake configurations or allow compatibility with both sets of protocols. If you know a better way, please let me know. This has been challenging
This is a total loop but contrary to my response earlier, the iphone 14 updated to the newer ios version and still can connect to the vpn, I don’t know what is happening.