Everdo is running on a server in my home. When my Android phone is connected to my home WiFi network, I can sync between the server and my phone without any issues.
Because I travel frequently, I access my home LAN via an OpenVPN device (a Raspberry Pi) to gain remote access to my server. When I connect my Android phone over LTE and OpenVPN, I can download FROM my Everdo server, but I cannot send data from my phone TO the server.
Any ideas? I would suspect an OpenVPN config error if I couldn’t get any connection, but being able to transmit data only one way is really strange…