One-time authentication is a new experimental feature designed to improve the security against CCA
Now it can be enabled on latest SS-libev.

Here is how I do it:

1, git clone latest SS-libev source code and compile to install on your server.
2, edit default SS-libev startup script.
3, Add "-A"('A' not 'a') parameter in do_start() function.
4, restart SS-libev service.

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Once you enabled this feature on server side ,YOU MUST ENABLE it on client too,Or you will got errors.

If you are using ss-local on Ubuntu Linux like me, so just do the same things on Client side.

If you are using Android Client, don't forget to turn this switch on.

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If you are using Windows SS Client,seems you need a new version SS-C# Client from here.

If you are using iPhone, throw that shit out and buy a Nexus.