SmartFoxServer 2X v2.10.0 is out, providing protocol encryption for all TCP and UDP communications. The secure connection uses the standard TLS protocol with X.509 certificates for counterparty authentication and AES 128-bit symmetric encryption for data exchange.
The release comes as a cumulative patch (requires SFS2X 2.9.x) and also provides a series of fixes and additions as discussed in the past months in the support forums.
The update comes with new client API for ActionScript 3, C#/Unity and Java/Android (encryption support for C++ and Objective-C clients, will be available in the next few weeks).
You can read the full release notes and download the patch from this page.