Single:No_Traffic instead of MULTIPLE:MULTIPLE - Why can't I establish UDP conn?

[torontob]

Hi Everyone,

When trying OpenVPN on any UDP port I get Single:No_Traffic. If it's tried on any TCP port it works fine and connects and state shows me Multiple:Multiple and all is fine.

We checked with ISP and the DSL modem there is nothing that blocks UDP ports.

What and where should I look at next to further diagnose this?

Thanks