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I opened up a report in the Feedback app because our VPNs weren't working in our App (Personal VPN using NEVPNManager, not manually in the Settings app). I got back the following answer: "Server does not seem to like the cipher proposal negotiated by the client. In iOS 14, we have upgraded the default ciphers proposed to more secure ciphers." Can anybody find any documentation that shows supported ciphers? For the life of me I can't find them listed anywhere.