The error "error": "There was a problem proxying the request" is a very generic and indicates some issue with Tyk proxying the request. It's typically a wrong target URL specified or some network routing issue e.g. DNS, firewall or another proxy. You typically want to verify that the target URL is reachable. If you deployed Tyk in a container then simply shell into it and test with a curl. You would find that you can't reach the target URL which the gateway also cannot reach. More info here