stentor wrote Remember to use the --duplicate-cn option if you want multiple clients using the same certificate or username to concurrently
Exactly as the error message suggests. If you want to share the same certificate between multiple clients, then you must add "
duplicate-cn" to your server.conf
Ideally, you would generate a unique certificate for each client. If you don't want to generate unique certificates, then use the
duplicate-cn command.
This is the cause of your problem, which only 1 client can connect.