Azure Java function failing while making outbound REST call - SocketException: Permission denied

Question

I have a Azure function written in Java which makes a REST call to one of our on-premise servers using its IP address and port.

i.e: GET http://<ip>:8090/example/endpoint.

The error it fails with is

HTTP/1.1 java.net.SocketException: Permission denied: connect

I have setup a VNET integration to make sure the IP is reachable from my function app.

I also got a NODE function in the same app, and that works just fine. So its something to do with the function being written in Java. Anybody hit this before and know a way to get around it?

Did you find any solution? – Khalid Bin Huda Apr 26 '19 at 12:25 — Khalid Bin Huda, Apr 26 '19 at 12:25
Solution: https://stackoverflow.com/a/55885125/5823681 – Khalid Bin Huda Apr 27 '19 at 21:46 — Khalid Bin Huda, Apr 27 '19 at 21:46

score 0 · Answer 1 · answered Jan 25 '18 at 07:41

1.You could try to set java.net.preferIPv4Stack = true by the code as below:

System.setProperty("java.net.preferIPv4Stack", "true")

2.You could try to access FQDN (fully qualified domain name) of your on-premise server. Please refer to the thread : Azure web app service to call onpremise WEB API using HttpClient using hybrid connection manager

Any concern , please let me know.

Azure Java function failing while making outbound REST call - SocketException: Permission denied

1 Answers1