<https://airvpn.org/forums/topic/24349-how-to-airvpn-via-sslstunnel-on-android-678/#comment-80910>
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"For Android 6 (\"Marshmallow\") on a Galaxy S2 Tab, I found it necessary to have all the stunnel files (.ssl, stunnel.crt) located in a folder on the sd card, and then place a link to that folder in the Termux \"HOME\" directory. Then I could just \"cd\" to the link in Termux, and successfully execute \"stunnel AirVPN*.ssl\".   For whatever reason, Marshmallow would not allow Termux to access files I copied to the HOME directory using \"Root Explorer\". I tried elevating to root, changing the SE context, ownership, and permissions. Nothing worked until I tried that link idea. I did not try coping the files from within Termux -- maybe that would have worked, but the link is very convenient.   Hope some find this useful.   Note: I subsequently discovered that the problem here was the \"SE Context\" tag in the copied files. The easiest fix is to just use the \"cp\" command in Termux to bring the .ssl and stunnel.crt files into the Termux HOME directory. Changing the \"SE Context\" to that created by the \"cp\" command will also work, but just using \"cp\" is easier. "
<https://airvpn.org/forums/topic/24349-how-to-airvpn-via-sslstunnel-on-android-678/?tab=comments#comment-68548>