We have a NodeJS based Google Cloud Speech API component, which works fine in many environments, but in a particular environment, we are getting below error.
Error: 14 UNAVAILABLE: Connect Failed
Any pointers where the issue is. We have a doubt this is related to connectivity, but how to confirm this?
I think the tests you did about enabling *.googleapis.com, speech.googleapis.com, oauth2.googleapis.com confirm that traffic is blocked in your end. Such google endpoints should remain accessible to request the Speech service.
I hope that the following recommendations help you:
Traffic blocked by Proxy. The link you referenced should work, just check the section NodeJS google-cloud-node. If you are using a programming language will need to set them up properly, this is a Java example.
Traffic blocked by Firewall. It is a bit more challenging due to involve Google Cloud IPs and they usually change. In such case you can find out those IPs with the command dig _netblocks.google.com txt and configure them in your firewall to allow the traffic.
This question is also related to yours: What is the Endpoint/Port used for Google Cloud Speech API.