Why are so many wireless clients seen when using airport utility?

When I open up the Airport Utility, I can see upwards of a dozen "wireless clients" connected to each of the two Airport Extremes that I have on my network. Some of these are known computers and iOS devices, but many of them have names that are IP addresses (like 10..0.0.3) or hexadecimal numbers (like 9C:FE:94:4B:75:FE). Not sure what these are. Can they slow down the network?

Take a few moments and count up the total number of wireless devices that you have.
In addition to computers, be sure to include printers, iPhones, iPads, Apple TVs, other Airport routers, other mobile devices, baby monitors, thermostats, etc......anything that uses a wireless signal from your network.
Some devices will be displayed by their name, others by assigned IP address and others by their MAC Address with 12 characters and colons.
Every device that is connected to your network uses up a certain amount of bandwidth, so the more devices that you have connected at one time, the slower the network will operate.
Unless you are lucky enough to have a very fast Internet connection plan with your provider, you may likely notice that browsing, email and other activities on the the wireless slow down when multiple devices are using the Internet, or you are copying files from one device to another over the network.
When you are ready, open AirPort Utility. Hold down the option key while you double click on your AirPort icon.
A window displaying wireless clients will be displayed. Compare the total of devices to your count. If you see more devices than you have, you may have an unwanted guest on your network. Change your wireless network password immediately.
Another thing that you can do is power off all of the wireless devices and then start them up one at a time while you are checking AirPort Utility.

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Airport Time capsule not found on mac when using AirPort Utility

I just purchased an AirPort Time Capsule to back up my files from my Mac. I have been able to set up the wireless portion, but when trying to access the backup portion through TimeMachine I cannot select my base. I am able to see it on my iPhone, but not on Mac. I have updated everything. Is this a known problem with the transition to Yosemite? Any suggestions?

Dead spot on.. Yosemite is pain plus..
I recommend you start over in your TC setup..
Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
N.B. None of your files on the hard disk of the TC are deleted.. this simply clears out the router settings of the TC.
Setup the TC again.
ie Start from a factory reset. No files are lost on the hard disk doing this.
Then redo the setup from the computer with Yosemite.
1. Use very short names.. NOT APPLE RECOMMENDED names. No spaces and pure alphanumerics.
eg TCgen5 and TCwifi for basestation and wireless respectively.
Even better if the issue is more wireless use TC24ghz and TC5ghz with fixed channels as this also seems to help stop the nonsense. But this can be tried in the second round.
2. Use all passwords that also comply but can be a bit longer. ie 8-20 characters mixed case and numbers.. no non-alphanumerics.
3. Ensure the TC always takes the same IP address.. you will need to do this on the main router using dhcp reservation.. or a bit more complex setup using static IP in the TC. But this is important.. having IP drift all over the place when Yosemite cannot remember its own name for 5 min after a reboot makes for poor networking. If the TC is main router it will not be an issue.
4. Check your share name on the computer is not changing.. make sure it also complies with the above.. short no spaces and pure alphanumeric.. but this change will mess up your TM backup.. so be prepared to do a new full backup. Sorry.. keep this one for second round if you want to avoid a new backup.
5. Mount the TC disk in the computer manually.
In Finder, Go, Connect to server from the top menu,
Type in SMB://192.168.0.254 (or whatever the TC ip is which you have now made static. As a router by default it is 10.0.1.1 and I encourage people to stick with that unless you know what you are doing).
You can use name.. SMB://TCgen5.local where you replace TCgen5 with your TC name.. local is the default domain of the TC and doesn't change.
However names are not so easy as IP address.. nor as reliable. At least not in Yosemite they aren't. The domain can also be an issue if you are not plugged or wireless directly to the TC.
6. Make sure IPv6 is set to link-local only in the computer. For example wireless open the network preferences, wireless and advanced / TCP/IP.. and fix the IPv6. to link-local only.
There is a lot more jiggery pokery you can try but the above is a good start.. if you find it still unreliable.. don't be surprised.
You might need to do some more work on the laptop itself. eg Reset the PRAM.. has helped some people. Clean install of the OS is also helpful if you upgrade installed.
Tell us how you go.

Why are there CORBA error messages -- COMM_FAILURE when using the orb obj?

Hi Guys,
I followed the tutorial http://download.oracle.com/javase/6/docs/technotes/guides/idl/GShome.html
compiled and run the code. Everything works fine however whenever I use the ORB orb object I get the following message
both in my Naming Service and the HelloServer output:
2010-12-10 12:35:46.505 FINE Transport to 127.0.1.1:44100: stream closed on read < 0
2010-12-10 12:35:46.506 FINE ServerGIOPConnection to 127.0.1.1:44100 (ec4a87): getMessage() -- COMM_FAILURE
2010-12-10 12:35:46.507 FINE ServerGIOPConnection to 127.0.1.1:44100 (ec4a87): streamClosed()
2010-12-10 12:35:46.508 FINE ServerGIOPConnection to 127.0.1.1:44100 (ec4a87): close()
Why is this happening?
I have also installed jacorb and added it to my class path and run the examples with:
jaco -Djacorb.config.dir=. -DORBid=HelloClient HelloServer
ns -Djacorb.naming.ior_filename=/home/zorg/Project/Java/CORBA/NameService/NS_Ref
jaco -Djacorb.config.dir=. -DORBid=HelloClient HelloClient
I have included the code from the tutorial for convinience:
// HelloServer.java
// Copyright and License
import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
import org.omg.PortableServer.*;
import org.omg.PortableServer.POA;
import java.util.Properties;
class HelloImpl extends HelloPOA {
private ORB orb;
public void setORB(ORB orb_val) {
    orb = orb_val;
// implement sayHello() method
public String sayHello() {
    return "\nHello world !!\n";
// implement shutdown() method
public void shutdown() {
    orb.shutdown(false);
public class HelloServer {
public static void main(String args[]) {
    try{
      // create and initialize the ORB
      ORB orb = ORB.init(args, null);
      // get reference to rootpoa & activate the POAManager
      POA rootpoa = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));
      rootpoa.the_POAManager().activate();
      // create servant and register it with the ORB
      HelloImpl helloImpl = new HelloImpl();
      helloImpl.setORB(orb);
      // get object reference from the servant
      org.omg.CORBA.Object ref = rootpoa.servant_to_reference(helloImpl);
      Hello href = HelloHelper.narrow(ref);
      // get the root naming context
      org.omg.CORBA.Object objRef =
          orb.resolve_initial_references("NameService");
      // Use NamingContextExt which is part of the Interoperable
      // Naming Service (INS) specification.
      NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
      // bind the Object Reference in Naming
      String name = "Hello";
      NameComponent path[] = ncRef.to_name( name );
      ncRef.rebind(path, href);
      System.out.println("HelloServer ready and waiting ...");
      // wait for invocations from clients
      orb.run();
      catch (Exception e) {
        System.err.println("ERROR: " + e);
        e.printStackTrace(System.out);
      System.out.println("HelloServer Exiting ...");
// Copyright and License
import HelloApp.*;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
public class HelloClient
static Hello helloImpl;
public static void main(String args[])
      try{
        // create and initialize the ORB
        ORB orb = ORB.init(args, null);
        // get the root naming context
        org.omg.CORBA.Object objRef =
            orb.resolve_initial_references("NameService");
        // Use NamingContextExt instead of NamingContext. This is
        // part of the Interoperable naming Service.
        NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
        // resolve the Object Reference in Naming
        String name = "Hello";
        helloImpl = HelloHelper.narrow(ncRef.resolve_str(name));
        System.out.println("Obtained a handle on server object: " + helloImpl);
        System.out.println(helloImpl.sayHello());
        helloImpl.shutdown();
        } catch (Exception e) {
          System.out.println("ERROR : " + e) ;
          e.printStackTrace(System.out);
}Edited by: 819887 on 10-Dec-2010 04:51
Edited by: 819887 on 10-Dec-2010 04:58

Figure out the actual problem is when the naming service is resolving the name on line:
helloImpl = HelloHelper.narrow(ncRef.resolve_str(name));

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Why are all urls coming up invalid when I am connected to my wireless network?

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First back up the registry
Go to Start > Run --> type in regedit and hit OK.
Navigate to the key HKEY_CURRENT_USER\Software\Classes\LocalSettings\Software\Microsoft\Windows\CurrentVersion\TrayNotify.
Delete the values IconStreams and PastIconsStream.
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Why are not pop up message window when message type I and W

Hi All,
I am working in BADI ( me_purchdoc_posted~posted) for t-code ME21N. Actually i want show material number, material description and ABC indicator of material at saving point of PO if material is significant.
code is properly working but does not showing error message window when I am using message type I (information) or W (worming message) .
if i am using message type E ( error message )then showing message window just link Information message.
So i can no understand why are not message window pop up when i take message type I and W.
my code is that
method IF_EX_ME_PURCHDOC_POSTED~POSTED
IF SY-TCODE EQ 'ME21N' OR SY-TCODE EQ'ME21'.
DATA : wa LIKE LINE OF IM_EKPO.
DATA : VAR_MAKTX TYPE MAKT-MAKTX.
DATA : VAR_MAABC TYPE MARC-MAABC.
DATA : P TYPE STRING.
DATA : P1 TYPE STRING.
LOOP AT IM_EKPO INTO wa.
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ENDLOOP.
ENDIF.
endmethod.
guide me...............

Hi vinod,
thanks for reply......
yes, my requirement is to show the popup window with material number, material description and ABC indicator of material at saving point of PO if material is significant.
I find Badi to transaction me21n at saving PO. Badi ME_PROCESS_PO_CUST does not exist.
so i am using Badi me_purchdoc_posted~posted.
This Badi ( me_purchdoc_posted~posted ) is properly working But showing message "system error ( error in method po_post ) "
when I am click on OK then automatic leave from transaction.
guide me..........

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Message was edited by: Kevin Shain

Hi. I'm trying to set-up the wireless access times in my Airport Utility. I need to enter the "Description" and the "MAC Address" of each wireless client before I assign access times. What are these? Thanks.

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Tap General
Tap About
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Why are so many wireless clients seen when using airport utility?

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