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POjava.net.UnknownHostException: url
 

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    <p>I have written a java file which opens a HTTPS connection to a server that has given restricted access to call its web services from our unix server. So we are able to ping the server ip, telnet the server ip with port 443 all successfully so the network team has given confirmation that the we can start calling the webservices. Now we have tried everything on Windows server, installed the certificates they have provided in the local folder and simply run the jar. and we were able to establish connection. Now we have to migrate to unix server. We have copied the certificates local to the jar. On running the jar we get the following exception.</p> <pre><code> java.net.UnknownHostException: wugateway2pi.westernunion.net at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:195) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at java.net.Socket.connect(Socket.java:529) at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:564) at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141) at sun.net.NetworkClient.doConnect(NetworkClient.java:163) at sun.net.www.http.HttpClient.openServer(HttpClient.java:388) at sun.net.www.http.HttpClient.openServer(HttpClient.java:523) at sun.net.www.protocol.https.HttpsClient.&lt;init&gt;(HttpsClient.java:272) at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:329) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient (AbstractDelegateHttpsURLConnection.java:172) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect (AbstractDelegateHttpsURLConnection.java:158) at sun.net.www.protocol.http.HttpURLConnection.getOutputStream (HttpURLConnection.java:1014) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream (HttpsURLConnectionImpl.java:230) at utils.HelloWorld.heartbeat(HelloWorld.java:129) at utils.HelloWorld.main(HelloWorld.java:492) TRANSFAST: Some Error occurs during parsing the sendtrnx response java.lang.IllegalArgumentException: InputStream cannot be null at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:120) at utils.HelloWorld.heartbeat(HelloWorld.java:160) at utils.HelloWorld.main(HelloWorld.java:492) java.lang.RuntimeException: Exception in XML Parsing for the Response: at utils.HelloWorld.heartbeat(HelloWorld.java:184) at utils.HelloWorld.main(HelloWorld.java:492) Calling heartbeat noCall </code></pre> <p>No idea what is missing.</p> <p>Regards, Rache</p>
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    1. COPlease post the code.
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    2. COThe problem is a `UnknownHostException`, so it could be a DNS problem. What does a  `dig wugateway2pi.westernunion.net` gives you ? It could be a IPv4/v6 problem, too. What is configured on the machines ? Do you use `-Djava.net.preferIPv4Stack=true` switch ?
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