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I have two app ("A" and "B") and i want to bind these with an Azure function. "A" throw my Azure function (module tiers) and then, i want (from module tiers) send a request Http to "B" to retrieve data but it doesn't work.

To be sure all port or another stuff is open, i created a VM on same subnet as "B" and module tiers and this test VM can retrieve data after put my basic auth login/password via chrome navigator.

Here, i'm sure it is possible to reach my data but...

The Azure function create in Java cannot reach my precious data...

1st initiative : I tried to use Curl into my code with basic auth and when i want to do an "getInputStream()" there is trouble. The log said :

2021-08-17T07:09:03.405 [Error] Executed 'Functions.pagination' (Failed, Id=93357ae7-9dc3-453a-97e7-332cc653d187, Duration=1500ms)
Result: FailureException: IOException: CreateProcess error=2, The system cannot find the file specifiedStack: java.lang.reflect.InvocationTargetExceptionat

with this code :

    File file = File.createTempFile("test", "txt");
    Process process = Runtime.getRuntime().exec("curl --cookie \"Authorization=Basic " + encoding + "\" " + urlDenodo,
        null ,
        file);

2nd initiative : I tried to use HttpClient with Basic auth in header but i have an access denied The log said :

2021-08-17T08:57:05.059 [Error] Executed 'Functions.pagination' (Failed, Id=dd9480ec-f49b-4ddc-8d81-8f1dc6ab5e44, Duration=1032ms)
Result: FailureException: SocketException: Permission denied: connectStack: java.lang.reflect.InvocationTargetExceptionat java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

with this code :

        URL url = new URL (urlDenodo);
        String encoding = Base64.getEncoder().encodeToString(("admin:admin").getBytes("UTF-8"));

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        connection.setConnectTimeout(100000);
        //connection.setDoOutput(true);
        connection.setRequestProperty  ("Authorization", "Basic " + encoding);
        InputStream content = (InputStream)connection.getInputStream();
        BufferedReader in   =
            new BufferedReader (new InputStreamReader (content));
        String line;

But now, i don't know what to do in order to call "B" via a simple URL

Thanks to help me !

Konrad Rudolph
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Alexandre DONAZZAN
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1 Answers1

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Looks similar to Azure - permission denied when trying to connect to external MySQL database

The error message 'SocketException: Permission denied: connect' indicates that the connection is denied by the JVM that is running the client code (i.e. the Azure Function).

Azure Functions apparently blocks certain outbound connections. I'm not sure if it's because it's not using HTTPS or because it's using IPv6?

Can you try setting -Djava.net.preferIPv4Stack=true for your Azure Function A?

Or can you enable https for your application B? (you should do this anyway if you're using Basic Auth)

GeertPt
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