HTTPS hostname wrong: should be <sub.domain.com>. What causes this?

user_11249 0
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I am getting this 'HTTPS hostname wrong:' error when trying to connect to a server using https. My url looks something like this

https://sub.domain.com/tamnode/webapps/app/servlet.

I connect using the following code

    // Create a URLConnection object for a URL
    URL url = new URL(requestedURL);
    HttpURLConnection.setFollowRedirects(false);

    // connect
    connection = (HttpURLConnection) url.openConnection();
    connection.setDoOutput(true);
    connection.setRequestProperty("User-Agent", USER_AGENT); //$NON-NLS-1$

    OutputStreamWriter wr = new OutputStreamWriter(connection
            .getOutputStream());

but then get an error 

IOException: HTTPS hostname wrong:  should be <sub.domain.com>. 
    at sun.net.www.protocol.https.HttpsClient.checkURLSpoofing
    ....

This is code which has worked in the past but no longer. There have been some changes to the system architecture but I need to get more data before approaching those responsible.

What can cause this error? Can I turn off the URLSpoofing check?

https exception java
7 Answers

Java by default verifies that the certificate CN (Common Name) is the same as hostname in the URL. If the CN in the certificate is not the same as the host name, your web service client fails with the following exception: java.io.IOException: HTTPS hostname wrong: should be hostname as in the certificates.

user_115479880

This is just an alternative of 'svarog' post

static {

    HttpsURLConnection.setDefaultHostnameVerifier((hostname, session) -> hostname.equals("domain name"));
}
user_76697070

Use host name (dns name) as Alias name.

Ex:

keytool -import -alias <google.com> -file certificate_one.cer -keystore cacerts
user_113537640
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