Checking website availability via Apache HttpClient 4?

Question

Java

Good afternoon.
Help me figure out what my problem is.
There is this method:

private static Boolean checkHttp() throws IOException {
        RequestConfig config = RequestConfig.custom()
                .setConnectTimeout(80000)
                .setConnectionRequestTimeout(80000)
                .setSocketTimeout(80000).build();

        CloseableHttpClient client = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
        HttpResponse response = client.execute(new HttpGet(TestHttpStatus.HTTP_URL));
        int statusCode = response.getStatusLine().getStatusCode();
        client.close();
        return statusCode == 200;
    }

This method is run multiple times after the service is restarted on the remote server.
The problem is that the first time it works fine, but when I try to call it further in the code, I get an exception:

org.apache.http.conn.HttpHostConnectException: Connect to 1.2.0.3:8023 [/1.2.0.3] failed: Connection refused: connect
  at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:156)
  at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:374)
  at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)
  at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
  at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
  at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
  at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
  at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
  at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
  at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)
  at TestHttpStatus.checkHttp(TestHttpStatus.java:46)
  at TestHttpStatus.main(TestHttpStatus.java:32)
Caused by: java.net.ConnectException: Connection refused: connect
  at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
  at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
  at java.net.Socket.connect(Socket.java:589)
  at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
  at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
  ... 11 more

It seems that I use CloseableHttpClient and close it, but it still doesn't work.
I'm looking for help or advice on how to fix this.