diff --git a/src/main/java/nl/komtek/gpi/controllers/GunbotProxyController.java b/src/main/java/nl/komtek/gpi/controllers/GunbotProxyController.java
index f74fcfe..954be59 100644
--- a/src/main/java/nl/komtek/gpi/controllers/GunbotProxyController.java
+++ b/src/main/java/nl/komtek/gpi/controllers/GunbotProxyController.java
@@ -20,6 +20,7 @@ import org.springframework.web.bind.annotation.ResponseBody;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
 import java.math.BigDecimal;
 import java.time.ZoneOffset;
 import java.util.List;
@@ -145,15 +146,16 @@ public class GunbotProxyController {
 	                                HttpServletResponse response,
 	                                @RequestParam String currencyPair,
 	                                @RequestParam BigDecimal rate,
-	                                @RequestParam BigDecimal amount) {
+	                                @RequestParam BigDecimal amount) throws IOException {
 
 		boolean globalSellOnlyMode = Boolean.parseBoolean(util.getConfigurationProperty("sellOnlyMode"));
 		boolean pairSellOnlyMode = Boolean.parseBoolean(util.getConfigurationProperty(String.format("%s_sellOnlyMode", currencyPair)));
 		if (globalSellOnlyMode || pairSellOnlyMode) {
+			JsonObject jsonObject = new JsonObject();
 			String message = String.format("You are not allowed to buy. Sell Only mode is active for %s", currencyPair);
-			logger.info(message);
-			response.setStatus(403);
-			return message;
+			jsonObject.addProperty("error", message);
+			logger.info(jsonObject.toString());
+			return jsonObject.toString();
 		}
 
 		String key = request.getHeader("key");
diff --git a/src/main/java/nl/komtek/gpi/services/GunbotProxyService.java b/src/main/java/nl/komtek/gpi/services/GunbotProxyService.java
index e172fea..6fac559 100644
--- a/src/main/java/nl/komtek/gpi/services/GunbotProxyService.java
+++ b/src/main/java/nl/komtek/gpi/services/GunbotProxyService.java
@@ -83,7 +83,6 @@ public class GunbotProxyService {
 
 		retryPolicy = new RetryPolicy()
 				.retryOn(failure -> failure instanceof Exception)
-				.abortOn(failure -> failure.getMessage().startsWith("error:"))
 				.withDelay(500, TimeUnit.MILLISECONDS)
 				.withMaxRetries(maxRetries);
 	}
@@ -343,7 +342,7 @@ public class GunbotProxyService {
 			throw new ProxyHandledException("No value was returned");
 		} else if (result.contains("Nonce")) {
 			throw new ProxyHandledException("nonce error: " + result);
-		} else if (result.contains("error:")) {
+		} else if (result.contains("Connection timed out")) {
 			throw new RuntimeException(result);
 		}
 		return result;
diff --git a/src/main/java/nl/komtek/gpi/utils/Util.java b/src/main/java/nl/komtek/gpi/utils/Util.java
index 9e6865b..597d7fb 100644
--- a/src/main/java/nl/komtek/gpi/utils/Util.java
+++ b/src/main/java/nl/komtek/gpi/utils/Util.java
@@ -9,7 +9,6 @@ import org.springframework.util.StringUtils;
 
 import java.io.FileInputStream;
 import java.io.InputStream;
-import java.util.Properties;
 
 /**
  * Created by Elroy on 10-7-2017.
@@ -32,9 +31,9 @@ public class Util {
 		try (InputStream input = new FileInputStream("configuration.properties")) {
 			prop.load(input);
 			value = prop.getProperty(key);
-			logger.debug(String.format("reading property key %s -- value %s"), key, value);
+			logger.debug(String.format("reading property key %s -- value %s", key, value));
 		} catch (Exception e) {
-			logger.error("Error reading configuration file", e.getMessage());
+			logger.error("Error reading configuration file", e);
 		}
 		return value;
 	}