diff --git a/ipbc-Client/ipbc-Client.xcodeproj/project.xcworkspace/xcuserdata/gerrit.xcuserdatad/UserInterfaceState.xcuserstate b/ipbc-Client/ipbc-Client.xcodeproj/project.xcworkspace/xcuserdata/gerrit.xcuserdatad/UserInterfaceState.xcuserstate
index afe339d..ebb949d 100644
Binary files a/ipbc-Client/ipbc-Client.xcodeproj/project.xcworkspace/xcuserdata/gerrit.xcuserdatad/UserInterfaceState.xcuserstate and b/ipbc-Client/ipbc-Client.xcodeproj/project.xcworkspace/xcuserdata/gerrit.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/ipbc-Client/ipbc-Client/WebserviceClient.h b/ipbc-Client/ipbc-Client/WebserviceClient.h
index b54d2aa..e7d0736 100644
--- a/ipbc-Client/ipbc-Client/WebserviceClient.h
+++ b/ipbc-Client/ipbc-Client/WebserviceClient.h
@@ -13,6 +13,7 @@
     NSTimer *updateTimer;
     NSString *usersIPv4;
     BOOL isNetworkAvailable;
+    BOOL isRequestRunning;
 }
 
 -(BOOL)updateDomain;
diff --git a/ipbc-Client/ipbc-Client/WebserviceClient.m b/ipbc-Client/ipbc-Client/WebserviceClient.m
index 3cc6aa1..54531f9 100644
--- a/ipbc-Client/ipbc-Client/WebserviceClient.m
+++ b/ipbc-Client/ipbc-Client/WebserviceClient.m
@@ -19,13 +19,24 @@
                                            userInfo: nil
                                             repeats: YES];
     
+    isRequestRunning = NO;
+    
     isNetworkAvailable = NO;
     [self checkNetworkAvailability];
 }
 
 - (void)tick:(NSTimer *)theTimer {
-    if(isNetworkAvailable) {
+    if(isNetworkAvailable && !isRequestRunning) {
         [self updateDomain];
+    } else {
+        // else for logging only
+        
+        if(!isNetworkAvailable) {
+            NSLog(@"no ip update, 'cause network unavailable");
+        }
+        if(isRequestRunning) {
+            NSLog(@"no ip update, 'cause of active request");
+        }
     }
 }
 
@@ -82,16 +93,14 @@
     } else {
         NSLog(@"compare stored %@ with %@", storedIPv4, fetchedIPv4);
         BOOL changed = [storedIPv4 isEqualToString:fetchedIPv4];
-        
-        if(changed) {
-            [[NSUserDefaults standardUserDefaults] setObject:fetchedIPv4 forKey:@"value.ip.ipv4"];
-        }
-        
         return changed;
     }
 }
 
 -(BOOL)doWebServiceUpdate {
+    NSLog(@"update ip to %@", usersIPv4);
+    isRequestRunning = YES;
+    
     NSString *settingTempName = [[NSUserDefaults standardUserDefaults] stringForKey:@"setting.name"];
     NSString *settingTempToken = [[NSUserDefaults standardUserDefaults] stringForKey:@"setting.token"];
     
@@ -108,25 +117,21 @@
     NSData *postData = [NSJSONSerialization dataWithJSONObject:tmp options:0 error:&error];
     [request setHTTPBody:postData];
     
-    NSLog(@"update ip to %@", usersIPv4);
-    //NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];
-    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
+    /*NSData *resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
+    NSString *strData = [[NSString alloc]initWithData:resultData encoding:NSUTF8StringEncoding];
+    NSLog(@"resultData: %@", strData);*/
+    
+    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *resultData, NSError *error) {
+        NSString *strData = [[NSString alloc]initWithData:resultData encoding:NSUTF8StringEncoding];
+        NSLog(@"resultData: %@", strData);
+        
+        // locally save posted ip
+        [[NSUserDefaults standardUserDefaults] setObject:usersIPv4 forKey:@"value.ip.ipv4"];
+        
+        isRequestRunning = NO;
+    }];
     
-    NSString *strData = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
-    NSLog(@"data: %@", strData);
     return YES;
-    
-    /*NSString *post = [NSString stringWithFormat:@"name=%@&token=%@", settingTempName, settingTempToken];
-    NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
-    
-    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];
-    
-    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
-    [request setURL:[NSURL URLWithString:WS_RESOURCE]];
-    [request setHTTPMethod:@"POST"];
-    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
-    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
-    [request setHTTPBody:postData];*/
 }
 
 -(NSString *)fetchIPv4 {