diff --git a/src/main/java/org/influxdb/InfluxDBFactory.java b/src/main/java/org/influxdb/InfluxDBFactory.java
index aee28d73..a96fbb87 100644
--- a/src/main/java/org/influxdb/InfluxDBFactory.java
+++ b/src/main/java/org/influxdb/InfluxDBFactory.java
@@ -6,6 +6,8 @@
 import okhttp3.OkHttpClient;
 import org.influxdb.impl.Preconditions;
 
+import java.net.URL;
+import java.net.MalformedURLException;
 import java.util.Objects;
 
 
@@ -27,6 +29,7 @@ public enum InfluxDBFactory {
    */
   public static InfluxDB connect(final String url) {
     Preconditions.checkNonEmptyString(url, "url");
+    Preconditions.checkHasPort(url);
     return new InfluxDBImpl(url, null, null, new OkHttpClient.Builder());
   }
 
@@ -44,6 +47,7 @@ public static InfluxDB connect(final String url) {
    */
   public static InfluxDB connect(final String url, final String username, final String password) {
     Preconditions.checkNonEmptyString(url, "url");
+    Preconditions.checkHasPort(url);
     Preconditions.checkNonEmptyString(username, "username");
     return new InfluxDBImpl(url, username, password, new OkHttpClient.Builder());
   }
@@ -59,6 +63,7 @@ public static InfluxDB connect(final String url, final String username, final St
    */
   public static InfluxDB connect(final String url, final OkHttpClient.Builder client) {
     Preconditions.checkNonEmptyString(url, "url");
+    Preconditions.checkHasPort(url);
     Objects.requireNonNull(client, "client");
     return new InfluxDBImpl(url, null, null, client);
   }
@@ -79,6 +84,7 @@ public static InfluxDB connect(final String url, final OkHttpClient.Builder clie
    */
   public static InfluxDB connect(final String url, final String username, final String password,
       final OkHttpClient.Builder client) {
+    Preconditions.checkHasPort(url);
     return connect(url, username, password, client, ResponseFormat.JSON);
   }
 
@@ -101,8 +107,10 @@ public static InfluxDB connect(final String url, final String username, final St
   public static InfluxDB connect(final String url, final String username, final String password,
       final OkHttpClient.Builder client, final ResponseFormat responseFormat) {
     Preconditions.checkNonEmptyString(url, "url");
+    Preconditions.checkHasPort(url);
     Preconditions.checkNonEmptyString(username, "username");
     Objects.requireNonNull(client, "client");
     return new InfluxDBImpl(url, username, password, client, responseFormat);
   }
+
 }
diff --git a/src/main/java/org/influxdb/impl/Preconditions.java b/src/main/java/org/influxdb/impl/Preconditions.java
index 1e34204a..d948bd03 100644
--- a/src/main/java/org/influxdb/impl/Preconditions.java
+++ b/src/main/java/org/influxdb/impl/Preconditions.java
@@ -1,5 +1,8 @@
 package org.influxdb.impl;
 
+import java.net.URL;
+import java.net.MalformedURLException;
+
 /**
  * Functions for parameter validation.
  *
@@ -59,4 +62,24 @@ public static void checkDuration(final String duration, final String name) throw
          + " for " + name);
     }
   }
+
+  /**
+   * Check url is legal
+   * @param url the server url
+   * @throws IllegalArgumentException if the port of url is miss
+   */
+  public static void checkHasPort(final String url) throws IllegalArgumentException{
+    String colon = ":";
+    if (!url.contains(colon) || url.endsWith(colon)) {
+      throw new IllegalArgumentException(String.format("The url [%s] port cannot be null", url));
+    }
+    try {
+      URL urlObj = new URL(url);
+      if (-1 == urlObj.getPort()) {
+        throw new IllegalArgumentException(String.format("The url [%s] port cannot be null", url));
+      }
+    } catch (MalformedURLException e) {
+      throw new RuntimeException(e);
+    }
+  }
 }
diff --git a/src/test/java/org/influxdb/InfluxDBFactoryTest.java b/src/test/java/org/influxdb/InfluxDBFactoryTest.java
index 74ebfab7..8ea56f59 100644
--- a/src/test/java/org/influxdb/InfluxDBFactoryTest.java
+++ b/src/test/java/org/influxdb/InfluxDBFactoryTest.java
@@ -54,4 +54,16 @@ public void testShouldThrowIllegalArgumentWithInvalidUrl() {
 			 InfluxDBFactory.connect("invalidUrl");
 		});
 	}
+
+	@Test
+	public void testUrlNotContainsColon() {
+		Assertions.assertThrows(IllegalArgumentException.class, () ->
+				InfluxDBFactory.connect("http://" + TestUtils.getInfluxIP()));
+	}
+
+	@Test
+	public void testUrlEndWithColon() {
+		Assertions.assertThrows(IllegalArgumentException.class, () ->
+				InfluxDBFactory.connect("http://" + TestUtils.getInfluxIP() + ":"));
+	}
 }