How to check a network connected system is in power on?

How to check whether a network connected system is in power on through its ip address? Is there a simple way in java to check that?
Thanks

How to check whether a network connected system is in
power on through its ip address? Is there a simple
way in java to check that?If you know that it normally has a server listening on a given port, then you can try to establish a connection on that port.
If the connection succeeds, it's powered on.
If the connection fails, you cannot know whether it's powered on or not. It may be on, but the server isn't running. It may be on with server running but the network path to that host may have a problem. It may be on, server running, good network path, etc., but the server may be very busy and the connection attempt may timeout. etc.

Similar Messages

  • How to check the Network Connectivity between two systems.

    Hello Everyone,
    Please let me know different ways to check the network connectivity between two systems other than ping/traceroute commands.
    Thank You.
    Edited by: 835435 on Jan 20, 2012 11:43 AM
    Edited by: 835435 on Jan 20, 2012 11:44 AM

    Use snoop.
    snoop -d <nic> - will give requests and replies coming/going in/out of the specified NIC.
    snoop -d <nic> <MAC address of the target host> - will give requests coming from the required host.

  • TS4002 When trying to access i message on my iPhone 4s an error message pops up; "Check your network connection or try again later" how can i fix this?

    When trying to access imessage on my iPhone 4s an error message pops up; "Check your network connection or try again later" how can i fix this? This became a problem after i updated the latest software update and i can't seem to fix it.

    Hi annmariefromuky,
    If you are having issues accessing iMessage, you may find the following article helpful:
    FaceTime, Game Center, Messages: Troubleshooting sign in issues
    http://support.apple.com/kb/ts3970
    Regards,
    - Brenden

  • Am from India. when i tried to turn on face time the error displayed is" Could not  sign in. Check your network connection and try again". how can it be resolved?

    Am from India. when i tried to turn on face time the error displayed is" Could not  sign in. Check your network connection and try again". how can it be resolved?

    If you are using someone else's WiFi they may have restrictions in place.
      (cofee shop, etc..)
    Have you tried connecting using at least more than one particular WiFi network ?
    You might want to try googling for a bandwidth test site
      verify you have reasonable throughput..
        1 megabit up and 1 megabit down..
          (bandwidthplace.com is what I typically use..)

  • Hi, I'm trying to set up my Time Machine, but I get this message: The server may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again. how to resolve?

    Hi, I'm trying to set up my Time Machine, but I get this message: The server may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again. how to resolve?

    Did you reboot the TC? That is always the first step.
    Reboot the whole network if that is not enough.
    If you still have issues.. come back to us but generally the best way is to factory reset the TC and start over.
    We need a bit more info on the whole network layout and what OS you are running. What model TC you have??

  • How do I activate iMessage when it tells me that I need to check my network connection but I have full internet connection?

    How do I activate iMessage when it tells me that I need to check my network connection but I have full internet connection?

    iOS: Troubleshooting FaceTime and iMessage activation                           
    FaceTime, Game Center, Messages: Troubleshooting sign in issues

  • '"Connection Failed" : The server "rrnas01" may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again' message

    '"Connection Failed" : The server "rrnas01" may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again' message keeps displaying whenever I try to open any Adobe CS5 applications (except for Adobe Acrobat Pro). It displays until I click "OK" about 15-20 times or so and then will finally let my program open.
    I have tried deleting files within my Library/Preferences folder and turning off/deleting login items within my system preferences as other forums suggested but nothing happened. Spending 3.5 hours on the phone with Adobe and completely uninstalling and then reinstalling the entire CS5 Master Collection didn't work either.
    Also, it may be helpful to know that my programs worked fine for about three weeks then when we got internet and changed the password (the join, not the adminstrative password) with the wireless network "ScubaSteve" (which I've used with no problems at my old apartment) it started acting up. I have never seen "rrnas01" before so I don't know at all where it came from. I also installed the free 30 day trial of Suitcase Fusion 3 recently, but thinking that could also be the cause I have uninstalled it, and still no help.
    Please help me! And please keep in mind I don't know all the computer lingo that a lot of the people in these forums seem to know. Thanks in advance for ny help you can give me.

    It may not be possible .. there is a major bug between Mountain Lion and the TC where the TC disk goes off the radar of the computer.
    Lion is also affected but not as badly.
    7.6.4 seems worse than earlier firmware.. so back to 7.6.1 or 7.5.2 if that is possible.
    Obviously that is not a solution for a later Gen5 TC.
    Reset to factory after the firmware downgrade. .use all network names that are short, no spaces and pure alphanumeric.
    If the TC is the main router set the dhcp to a very short lease time.. eg 30min.. and see how it goes, or try a longer lease like 99days.
    I prefer the very short lease but response has been mixed.
    Use ethernet not wireless.. ethernet is always more reliable and stable than wireless.
    And last .. a nightly electric timer that powers off every night at midnight for 1min.. would not be the first device we have suggested a fix that amounts to beat the unit to the punch by forcing it to reboot since it is unstable.

  • Nothing seems to solve my MacBook Pro problem 'Could not sign in.Please Check your network connection and try again'

    On old MacBook Pro Version 10.6.8 downloaded Facetime from the Mac Store as instructed but error loging in says 'Could not sign in.Please Check your network connection and try again'.
    I have follwed all these discussion fixes with DNS settings 8.8.8.8 and 8.8.4.4 and refreshing everything but nothing works.
    Help!
    I have also logged out of my other laptop and closed my phones Facetime.

    Hi KateD14!
    I have an article here that addresses this sign in issue with FaceTime and may have some troubleshooting steps to help you resolve this issue:
    FaceTime, Game Center, Messages: Troubleshooting sign in issues
    http://support.apple.com/kb/TS3970
    Resolution
    Try the following:
    Ensure that you have an active Internet connection.
    Verify that you are using a valid Apple ID at appleid.apple.com. You can also create an Apple ID or reset your password from this website. Other things you should confirm while logged into appleid.apple.com:
    Confirm that the email addresse(s) for your Apple ID has been verified.
    Check for miss-types of the email address
    Check the spelling of the email address
    Check that all letters are lower case
    Make sure that special characters are correct, e.g. no commas (,) where there is supposed to be full stops (.), etc.
    Note You may experience issues if your email address is associated with more than one Apple ID. If you have multiple Apple IDs, log in to appleid.apple.com with each Apple ID and confirm that each email address you wish to use for FaceTime or Messages is associated with only a single Apple ID.
    Make sure the date, time, and time zone are set correctly in Data & Time preferences, in System Preferences. Tip: Enable "Set date and time automatically" in Date & Time preferences to automatically keep this information accurate.
    If third-party firewall or port filtering software is installed, it needs to be configured to allow connections to apple.com, verisign.com and verisign.net. A list of ports required for using FaceTime and Messages is in Using FaceTime and iMessage behind a firewall. Please consult this article for further help configuring firewalls and Internet security software.
    If your /private/etc/hosts file has been modified, make sure that it is not interfering with communications to apple.com, verisign.com or verisign.net servers. Note: Some third-party software installers may modify the /private/etc/hosts file without alerting you. Instructions about how to check and resolve issues with a /private/etc/hosts file are in the "Blocked by configuration: (Mac OS X/Windows)" section of iTunes: Advanced iTunes Store troubleshooting
    Thanks for being a part of the Apple Support Communities!
    Regards,
    Braden

  • Where do I check my network connection in iTunes?

    I am having trouble finding how to check my network settings in iTunes. How do I do this? I am unable to connect to the store.

    Well, the answer is, you don't.  iTunes does not have any functionality that will display the status of your network connection.  This functionality is provided by the operating system/network adapter driver(s) on the host device, which is either your iPod, or your PC/Mac.
    FWIW, there were some very severe thunderstorms in Virginia last night.  Apparently those storms caused massive power outages, causing a rather large cloud network to go off-line.  Services like Instagram, NetFlix, and Pinterest were affected...

  • TS1424 I am having issues downloading music from iTunes, it comes up saying an unknown error has occurred - please check your network connection. Now I can connect to iTunes store and have itunes as an exception for downloads so don't know what else to do

    Hello, I've started having an issue downloading songs and apps from iTunes to our PC which has Windows XP Professional installed. We also use Karspersky Anti-Virus and Firefox as an internet browser. Have never had this issue before, it comes up with "An unknow error has occured and downloads are stopped with an error 8003. Also says please check your network connection" We have no issue connecting to iTunes store or the network so not sure how to fix this. It is very frustrating. Have checked Windows Firewall and iTunes is an exception, can't think of anything else why it won't work.

    I sounds as though you need to start again. The following article tells you how to completely remove iTunes and Quicktime. If you didn't actually install iTunes you wont find it in add/remove programs so you can't do that bit, but still delete the iTunes folder in Program Files as advised in the article.
    http://docs.info.apple.com/article.html?artnum=93698
    Once you have got rid of them, try installing the latest version of iTunes. There is a link to it in the article.
    Itunes wont move your music for you, get iTune sgoing then ask again.

  • HT5622 When trying to sign in to Face Time, I continually get Face Time Activation "Could not sign in.  Please check your network connection and try again"  I have reset my Apple ID and my Password and I am successfully logging into Safari.  What am I doi

    When trying to sign in to Face Time, I continually get "Face time Activation"  "Could not sign in.  Please check your network connection and try again".  I am able to access the internet via Safari, so my network connection seems to be working.  What am I doing wrong, and how can I access Face Time?

    Hey sklingen,
    Thanks for the question. I understand you are experiencing issues signing into FAceTime. The following article may help to resolve your issue:
    iOS: Troubleshooting FaceTime and iMessage activation
    http://support.apple.com/kb/TS4268
    You may also want to reset your network settings:
    Settings > General > Reset > Reset Network Settings.
    Note: this will delete any network related settings (saved Wi-Fi passwords, etc), it will not erase any content from your device.
    Thanks,
    Matt M.

  • TS4268 Every time i try to log into FaceTime it just says unable to connect please check your network connection and try again I've waited up to a month of time and it still won't work!! Please Help!!!

    Please help whenever I try to log into FaceTime it's says unable to connect please check you network connection than try again I've tried everything and even waited up to an month for something to change but nothing has!! Please Help!!!

    Using FaceTime http://support.apple.com/kb/ht4319
    Troubleshooting FaceTime http://support.apple.com/kb/TS3367
    The Complete Guide to FaceTime + iMessage: Setup, Use, and Troubleshooting
    http://tinyurl.com/a7odey8
    Troubleshooting FaceTime and iMessage activation
    http://support.apple.com/kb/TS4268
    iOS: FaceTime is 'Unable to verify email because it is in use'
    http://support.apple.com/kb/TS3510
    Using FaceTime and iMessage behind a firewall
    http://support.apple.com/kb/HT4245
    iOS: About Messages
    http://support.apple.com/kb/HT3529
    Set up iMessage
    http://www.apple.com/ca/ios/messages/
    iOS 6 and OS X Mountain Lion: Link your phone number and Apple ID for use with FaceTime and iMessage
    http://support.apple.com/kb/HT5538
    How to Set Up & Use iMessage on iPhone, iPad, & iPod touch with iOS
    http://osxdaily.com/2011/10/18/set-up-imessage-on-iphone-ipad-ipod-touch-with-io s-5/
    Extra FaceTime IDs
    http://tinyurl.com/k683gr4
    Troubleshooting Messages
    http://support.apple.com/kb/TS2755
    Troubleshooting iMessage Issues: Some Useful Tips You Should Try
    http://www.igeeksblog.com/troubleshooting-imessage-issues/
    Setting Up Multiple iOS Devices for iMessage and Facetime
    http://macmost.com/setting-up-multiple-ios-devices-for-messages-and-facetime.htm l
    FaceTime and iMessage not accepting Apple ID password
    http://www.ilounge.com/index.php/articles/comments/facetime-and-imessage-not-acc epting-apple-id-password/
    Fix Can’t Sign Into FaceTime or iMessage iOS 7
    http://ipadtutr.com/fix-login-facetime-imessage-ios-7/
    FaceTime, Game Center, Messages: Troubleshooting sign in issues
    http://support.apple.com/kb/TS3970
    Unable to use FaceTime and iMessage with my apple ID
    https://discussions.apple.com/thread/4649373?tstart=90
    How to Block Someone on FaceTime
    http://www.ehow.com/how_10033185_block-someone-facetime.html
    My Facetime Doesn't Ring
    https://discussions.apple.com/message/19087457
    Send an iMessage as a Text Message Instead with a Quick Tap & Hold
    http://osxdaily.com/2012/11/18/send-imessage-as-text-message/
    To send messages to non-Apple devices, check out the TextFree app https://itunes.apple.com/us/app/text-free-textfree-sms-real/id399355755?mt=8
    How to Send SMS from iPad
    http://www.iskysoft.com/apple-ipad/send-sms-from-ipad.html
    You can check the status of the FaceTime/iMessage servers at this link.
    http://www.apple.com/support/systemstatus/
     Cheers, Tom

  • Word 2008 A file error has occurred. Check your network connections . . .

    Word 2008 12.1.2 throws an error dialog when trying to save a docx file:
    "A file error has occurred. Check your network connections or make sure the disc is properly inserted and not defective (nameoffile.docx)"
    Newsgroups recommend to trash the Normal.dotm and let Word re-create that template but that doesn't solve the problem.
    Newgroups also recommend specifying the file location of User Templates. That's doesn't help either.
    A new file, however, does not appear to be a problem after following these suggestions. So there may be something wrong with my file.
    I suspect it has something to do with the gutter and mirror margins because when these features are manipulated, Word 2008 inserts an extra "section next page" that I am not happy with, and the page numbering and sometimes section numbering gets thrown off.
    Actually, I don't care WHY it's happening. I just want to know HOW to avoid this error. I cannot save changes to an important docx file anymore.
    My work around: "Save as" to doc format and continue working!
    However, I would prefer to keep working in docx format because Word bloats doc files incessantly, but docx seems to keep file size in check.

    that was only a temporary fix. It didn't work well for long. Back to problems with both doc and docx versions of the same file.
    Are there any other general swathes I can make, e.g. repair permissions (been there, done that)? I have trashed Normal.dotm, the 2008 preference files and repaired permissions.
    docx files throw the error dialog, doc files crash Word on a regular basis.
    Any more ideas?

  • TS3367 I'm trying to use FaceTime on my new iPad but I keep getting this message could not sign in check your network connection

    I'm trying to use FaceTime on my new iPad but I keep getting this message could not sign in check your network connection.

    Look at iOS Troubleshooting Wi-Fi networks and connections  http://support.apple.com/kb/TS1398
    iPad: Issues connecting to Wi-Fi networks  http://support.apple.com/kb/ts3304
    iOS: Recommended settings for Wi-Fi routers and access points  http://support.apple.com/kb/HT4199
    Additional things to try.
    Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
    Change the channel on your wireless router. Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
    Another thing to try - Go into your router security settings and change from WEP to WPA with AES.
    How to Quickly Fix iPad 3 Wi-Fi Reception Problems
    http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
    If none of the above suggestions work, look at this link.
    iPad Wi-Fi Problems: Comprehensive List of Fixes
    http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
    Fix iPad Wifi Connection and Signal Issues  http://www.youtube.com/watch?v=uwWtIG5jUxE
     Cheers, Tom

  • My iMessage will not let me sign in.  The error message "Please check your network connection and try again" keeps popping up. I am connected to wifi.

    My iMessage will not let me sign in.  The error message "Please check your network connection and try again" keeps popping up. I am connected to wifi.

    Welcome to Apple Support Discussions,
    Have you tried:
    Turn FaceTime or iMessage off and then back on in Settings.
    Launch Settings by tapping the icon on the Home screen
    Scroll down to Messages or FaceTime
    Toggle the switch from on (green) to off (white)
    Wait a minute
    Toggle the switch back to on (green)
    Wait for it to re-activate
    Hard reboot your iPhone, iPod touch, or iPad
    Make sure you're on Wi-Fi
    Hold down both the Home button on the front, and the Sleep/Wake button on the top of your device
    Wait for the Apple logo to appear
    If it still doesn't work, repeat step 1 (turning FaceTime or iMessage off and on)
    Reset network settings
    Launch Settings by tapping on the icon on the Home screen
    Tap on General
    Scroll all the way to the bottom and tap on Reset
    Tap on Reset Network Settings
    If it still doesn't work, repeat step 1, then step 2, above (Turning FaceTime or iMessage off and one, rebooting).
    (Source: http://www.imore.com/having-trouble-imessage-or-facetime-ios-7-heres-how-fix-it)

Maybe you are looking for