I have an openvpn server set up on a raspberrypi 3 and the openvpn app on android.
I can use openvpn fine on mobile data, and have used it on private wifi connections fine. What I am struggling with is getting it to work on Spark free wifi. It seems to connect/authenticate fine, but I cannot do anything from there. Nothing will load in browsers/facebook/email etc etc. Yet when I use the Astrill app, I can use their vpn services fine.
Any ideas as to how/why I cannot get my own VPN to work, yet it works fine with Astrill?