The errors in the console are
error 10:49:12.549339+0800 NEIKEv2Provider IKEv2Session[1, B93E8A0C8B3195AE-0000000000000000] Failed to receive IKE SA Init reply (connect)
error 10:49:13.082739+0800 NEIKEv2Provider IKEv2Session[2, A655498A54D72B0C-0000000000000000] Failed to receive IKE SA Init reply (connect)
error 10:49:18.415019+0800 neagent __plugin endUsing for '46B3D0ED-0FA1-4378-9F8E-668F937D41EF' returned error: [u 200C1217-B935-54B8-90D4-6D1B124F4EF6:m (null)] [com.apple.NetworkExtension.IKEv2Provider(1.0)] endUsingRequest: called with unknown/expired request [010E220F-2B88-45C1-831B-22169228BA28]
error 10:49:35.988519+0800 runningboardd [xpcservice<com.apple.NetworkExtension.IKEv2Provider([osservice<com.apple.neagent(501)>:18076:18076])(501)>{vt hash: 0}:29644] Memorystatus failed with unexpected error: Invalid argument (22)
error 10:49:36.015419+0800 NEIKEv2Provider Bootstrapping; external subsystem UIKit_PKSubsystem refused setup
error 10:49:36.031420+0800 NEIKEv2Provider cannot open file at line 49450 of [1b37c146ee]
error 10:49:36.031435+0800 NEIKEv2Provider os_unix.c:49450: (2) open(/private/var/db/DetachedSignatures) - No such file or directory
error 10:50:07.073364+0800 NEIKEv2Provider IKEv2Session[1, 45029BCAF6EA8C7E-0000000000000000] Failed to receive IKE SA Init reply (connect)
error 10:50:38.102365+0800 NEIKEv2Provider IKEv2Session[2, 05C87694B50DCD36-0000000000000000] Failed to receive IKE SA Init reply (connect)
error 10:50:38.104871+0800 NEIKEv2Provider Failed to find suitable address, path supports IPv4 yes IPv6 no
error 10:51:09.134447+0800 NEIKEv2Provider IKEv2Session[3, 1578A7063FB21322-0000000000000000] Failed to receive IKE SA Init reply (connect)
error 10:51:09.137326+0800 NEIKEv2Provider Failed to find suitable address, path supports IPv4 yes IPv6 no
error 10:51:09.146182+0800 NEIKEv2Provider [Extension com.apple.NetworkExtension.IKEv2Provider]: Started with error The VPN server did not respond.
error 10:51:14.169812+0800 neagent __plugin endUsing for 'DEC188BD-2719-407B-A2A7-2ABBD747352A' returned error: [u 200C1217-B935-54B8-90D4-6D1B124F4EF6:m (null)] [com.apple.NetworkExtension.IKEv2Provider(1.0)] endUsingRequest: called with unknown/expired request [C6A95481-223A-46AB-A593-CF9B06E84B59]
Do these indicate that macOS is having a problem, or the VPN server is?
