[Q] Why can I not access an open port on my server under Android?

I cannot connect to the CalDAV / CardDAV port of my server from my CM11 device.

telnet to server port from (non-Android Linux) laptop over wifi/LAN works fine

telnet to server port from (Linux) laptop connected to net via a USB 3G tether provided by the exact same phone/provider I'm having my issue with - fine

telnet from pretty much anywhere on the internet to my server port on a non-Android platform - all seems fine

telnet from my Android (CM) terminal (Terminal IDE is my fave but I've tried this with various terminal emulators) as root to my server - not fine. Why?

I know the issue isn't with my server, router or my 3G connection/ service provider - this has to be an Android / Android networking issue.

Note I'm not actually trying to telnet, I just use telnet to ping ports.

Any tips?

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