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in my application I am trying to do a HTTPS POST request to my server.
However, I keep getting SSLHandshakeException - Chain chain validation failed, all the time. I tried to send a request using POSTMAN and I got a response from the server. What can be causing this error when I try to send the request from the application?

Here a code snippet where I try to send the post request:

 public static JSONObject getDataLibConfiguration(Context context) throws HttpRequestException {

 int statusCode = 0;

 JSONObject commonInformation;
 HttpsURLConnection connection = null;

 try 

 commonInformation = ConfigurationProcessor.getCommonInformation(context);
 if (commonInformation == null) 
 return null;
 

 URL url = new URL(BuildConfig.SERVER_CONFIG_URL);
 if (BuildConfig.DEBUG) 
 LogUtils.d(TAG, "url = " + url.getPath());
 

 connection = getHttpsConnection(url);
 connection.setDoOutput(true);
 connection.setDoInput(true);
 connection.setRequestMethod("POST");
 connection.setRequestProperty("Content-Type", "application/json; charset=UTF-8");
 connection.setRequestProperty("Content-Encoding", "gzip");

 byte gzipped = HttpUtils.gzip(commonInformation.toString());
 cos = new CountingOutputStream(connection.getOutputStream()); //<-- This is where I get the exception
 cos.write(gzipped);
 cos.flush();

 statusCode = connection.getResponseCode();
 // More code her
 

private static HttpsURLConnection getHttpsConnection(URL url) throws IOException, GeneralSecurityException 

 HttpsURLConnection connection = (HttpsURLConnection) url.openConnection();

 try 
 SSLContext sslContext = SSLContext.getInstance("TLS");
 MatchDomainTrustManager myTrustManager = new MatchDomainTrustManager(url.getHost());
 TrustManager tms = new TrustManagermyTrustManager;
 sslContext.init(null, tms, null);
 SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
 connection.setSSLSocketFactory(sslSocketFactory);
 catch (AssertionError ex) 
 if (BuildConfig.DEBUG) 
 LogFileUtils.e(TAG, "Exception in getHttpsConnection: " + ex.getMessage());
 
 LogUtils.e(TAG, "Exception: " + ex.toString());
 
 return connection;
 

The problem was that the certificate was expired.