com.approuter.module.http.protocol.HttpConnectionException: Received Http Code:500

Question

I am hitting Prod WSDL to get data by HTTP Post request. but it is running successfully like 1st, 2nd, 4th day and failed in 3rd, 5th day due to Error: Unable to connect to server after 5 attempts. Error is: com.approuter.module.http.protocol.HttpConnectionException: Received Http Code:500

ERROR:java.net.SocketTimeoutException: Read timed out
        java.net.SocketTimeoutException: Read timed out
               at java.net.SocketInputStream.socketRead0(Native Method)
               at java.net.SocketInputStream.read(Unknown Source)
               at java.net.SocketInputStream.read(Unknown Source)
               at sun.security.ssl.InputRecord.readFully(Unknown Source)
               at sun.security.ssl.InputRecord.read(Unknown Source)
               at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
               at sun.security.ssl.SSLSocketImpl.readDataRecord(Unknown Source)
               at sun.security.ssl.AppInputStream.read(Unknown Source)
               at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:149)
               at org.apache.http.impl.io.SocketInputBuffer.fillBuffer(SocketInputBuffer.java:110)
               at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:264)
               at org.apache.http.impl.conn.LoggingSessionInputBuffer.readLine(LoggingSessionInputBuffer.java:115)
               at org.apache.http.impl.conn.DefaultResponseParser.parseHead(DefaultResponseParser.java:98)
               at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:252)
               at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:281)
               at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:247)
               at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:219)
               at com.eviware.soapui.impl.wsdl.support.http.HttpClientSupport$SoapUIHttpRequestExecutor.doReceiveResponse(HttpClientSupport.java:147)
               at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)
               at org.apache.http.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:633)
               at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:454)
               at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
               at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
               at com.eviware.soapui.impl.wsdl.support.http.HttpClientSupport$Helper.execute(HttpClientSupport.java:233)
               at com.eviware.soapui.impl.wsdl.support.http.HttpClientSupport.execute(HttpClientSupport.java:323)
               at com.eviware.soapui.impl.wsdl.submit.transports.http.HttpClientRequestTransport.submitRequest(HttpClientRequestTransport.java:290)
               at  com.eviware.soapui.impl.wsdl.submit.transports.http.HttpClientRequestTransport.sendRequest(HttpClientRequestTransport.java:220)
               at com.eviware.soapui.impl.wsdl.WsdlSubmit.run(WsdlSubmit.java:119)
               at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
               at java.util.concurrent.FutureTask.run(Unknown Source)
               at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
               at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
               at java.lang.Thread.run(Unknown Source)