[hamid_rostami]

Bases on my investigations, it's been dropping all UDP datagrams.

[KomoD]

That sounds more like a firewall issue, I highly doubt your cloud provider blocked UDP entirely.

[ericpauley]

Which cloud provider? Is it possible it could be a firewall/security group config issue?

[hamid_rostami]

Well, it's situated in Iran and as you might know they're applying highly restricted rules on traffic. I doubt there is a firewall issue. I have UDP connections from a peer within Iran, but absolutely nothing from outside.