diff --git a/src/main/java/net/lacnic/portal/auth/client/PortalWSClient.java b/src/main/java/net/lacnic/portal/auth/client/PortalWSClient.java
index cf354bf..d5d099a 100644
--- a/src/main/java/net/lacnic/portal/auth/client/PortalWSClient.java
+++ b/src/main/java/net/lacnic/portal/auth/client/PortalWSClient.java
@@ -143,7 +143,8 @@ public static Properties getPaiProperties() {
 		try (InputStream input = new FileInputStream(CONF_DIR.concat("/pai.properties"))) {
 			prop.load(input);
 		} catch (IOException ex) {
-			ex.printStackTrace();
+			logger.error("An error occurred: {}", ex.getMessage(), ex);
+
 		}
 		return prop;
 	}
diff --git a/src/main/java/net/lacnic/portal/auth/client/Utils2FA.java b/src/main/java/net/lacnic/portal/auth/client/Utils2FA.java
index 46b6e67..9cc2331 100644
--- a/src/main/java/net/lacnic/portal/auth/client/Utils2FA.java
+++ b/src/main/java/net/lacnic/portal/auth/client/Utils2FA.java
@@ -8,6 +8,8 @@
 
 import org.apache.commons.codec.binary.Base32;
 import org.apache.commons.codec.binary.Hex;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.MultiFormatWriter;
@@ -18,6 +20,7 @@
 import de.taimos.totp.TOTP;
 
 public class Utils2FA {
+	private static final Logger logger = LoggerFactory.getLogger(Utils2FA.class);
 
 	private static final String UTF_8 = "UTF-8";
 
@@ -30,7 +33,7 @@ public static String obtenerSecretKey(String user) {
 			Utils2FA.createQRCode(barCodeUrl, calcularRutaImgQR, 300, 300);
 			return secretKey;
 		} catch (IOException | WriterException e) {
-			e.printStackTrace();
+			logger.error("An error occurred: {}", e.getMessage(), e);
 			return null;
 		}
 
diff --git a/src/main/java/net/lacnic/portal/auth/client/UtilsFiles.java b/src/main/java/net/lacnic/portal/auth/client/UtilsFiles.java
index f784085..d4ac3de 100755
--- a/src/main/java/net/lacnic/portal/auth/client/UtilsFiles.java
+++ b/src/main/java/net/lacnic/portal/auth/client/UtilsFiles.java
@@ -8,7 +8,11 @@
 import java.io.InputStream;
 import java.util.UUID;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 public class UtilsFiles {
+	private static final Logger logger = LoggerFactory.getLogger(UtilsFiles.class);
 
 	public static byte[] getBytesFromFile(String fileString) throws IOException {
 		return getBytesFromFile(new File(fileString));
@@ -23,7 +27,7 @@ public static byte[] calcularBytesImgQR(String secretKey) {
 		try {
 			return getBytesFromFile(calcularRutaImgQR(secretKey));
 		} catch (IOException e) {
-			e.printStackTrace();
+			logger.error("An error occurred: {}", e.getMessage(), e);
 			return null;
 		}
 	}
@@ -65,9 +69,9 @@ public static File obtenerFile(byte[] bytes, String extension) {
 
 			return file;
 		} catch (FileNotFoundException e) {
-			e.printStackTrace();
+			logger.error("An error occurred: {}", e.getMessage(), e);
 		} catch (Exception e) {
-			e.printStackTrace();
+			logger.error("An error occurred: {}", e.getMessage(), e);
 		}
 		return null;
 	}
diff --git a/src/main/java/net/lacnic/portal/auth/client/UtilsLogin.java b/src/main/java/net/lacnic/portal/auth/client/UtilsLogin.java
index 7e656c4..cda4334 100644
--- a/src/main/java/net/lacnic/portal/auth/client/UtilsLogin.java
+++ b/src/main/java/net/lacnic/portal/auth/client/UtilsLogin.java
@@ -45,7 +45,8 @@ public static LoginData loginTfa(String username, String password, String totp)
 			LoginData infoLDAP = PortalWSClient.getLoginDataTfa(username, password, totp);
 			return infoLDAP;
 		} catch (Exception e) {
-			e.printStackTrace();
+			logger.error("An error occurred: {}", e.getMessage(), e);
+
 			return new LoginData("Error: verifique usuario y/o contraseña");
 		}
 	}