The solution by one of our engineers
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So basically we had to edit the source code for the SFS client api
download the source code, edit the usage of Tcp cleint as follows:

In the SmartFoxClient class under the ConnectThread() method (line ...

Thank you Lapo
We'll try to make it work, and later report the result of the work here.

Thank you kindly for the reply Lapo.
So to make sure, even if the smartfox 1.x is in an IPv4 network, it won't connect with a client in an IPv6 network? (Like Test 3 here: http://forums.smartfoxserver.com/viewtopic.php?f=18&t=18486)
In other words, no app that relies on Smartfox 1.x will pass Apple ...

Hi,
Per the new iOS guidelines, any new submission to the app store must support IPv6.
http://www.internetsociety.org/deploy36 ... os-9-apps/

Does SmartFoxServer 1.x support IPv6 or has any issues with it?