Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm using openVPN to connect to one EC2 instance from another. The client cannot see the server, however, despite that servers outside of AWS can see the server and successfully negotiate with it.

It fails with "Cannot resolve host address": log output here. Config here

I speculate that this is because UDP isn't configured properly. I've already opened the ODP ports on that instance via the AWS SecurityGroups - this didn't work, both for all incoming UDP, and/or for UDP from the server IP.

Does anyone know what might be misconfigured in AWS to prevent this?

share|improve this question
Can you post your config? This looks like more of a configuration issue as it tries to resole the ip address... – Ulrich Dangel Jan 14 '13 at 0:36
There is no IP to resolve - I'm giving it the exact IP address – New Alexandria Jan 14 '13 at 16:54

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.