I have encountered strange problem when I was deploying our application to AWS (more precisely Elastic Beanstalk which is based on EC2). We are using certain VOIP provided whose address is
vh1107.ipex.cz. Application works normally on localhost (even on different hosting) however on AWS it fails to connect to this address. I also cannot ping it when I log to the instance, however it can ping any other internet address I tried. So what is wrong here? Could this address be on some AWS blacklist?
Sorry I've put my question wrongly. I know difference between HTTP and ICMP, the thing is however I can ping it from my own machine so it means that server listens to ICMP and problem is in the AWS. Same goes for any HTTP client, e.g.
curl vh1107.ipex.cz/calls -v runs fine on my machine but request hangs on AWS. Our former hosting can reach the server as well.