Mac suddenly can't connect to internet (but sees rest of network ok)

for some very odd reason one of our macs now refuses to see the internet.
all the macs are hooked up to a gigabit switch and then to our dsl line via a sisco firewall. the problem mac can see every other mac on the network and connect successfully to them but it will not access the internet. the network settings have not changed.
any suggestions?

hi jeff
thanks for the swift response. we don't use proxy settings. i changed another mac to the problem macs ip address and it wouldn't connect until i changed it back. i'm thinking it must be the firewall blocking that ip address.

Similar Messages

  • Only Chrome can connect to internet, but the rest cannot.  I have wifi or lan connect to router.

    Only Chrome can connect to internet, but the rest cannot.  I have wifi or lan connect to router.
    All my connection to the internet had been stopped after I setup my new bought imac, and transferred data from my previous mac book.
    The connect test showed I have no connection to the internet.  But the interest is, I can connect to internet with Google Chrome, but in a quite slow connection speed.
    Check several times with the router and switches, DNS, wifi, lan settings etc.
    Give up after hours of trying.

    At the same time, another mac book using the same router can connect to the internet.  Even my iphone can also using wifi to connect to the internet.
    Chrome in the imac can, but Safari and the internet test cannot.

  • My iphone suddenly can't connect to itune but my ipad can still connect.

    my iphone suddenly can't connect to itune but my ipad can still connect. i am using window 7 and the latest itune.

    Did a diagnostic test and this is the result.
    Microsoft Windows 7 x64 Home Premium Edition (Build 7600)
    TOSHIBA Satellite P850
    iTunes 12.0.1.26
    QuickTime 7.7.6
    FairPlay 2.7.39
    Apple Application Support 3.1
    iPod Updater Library 12.0
    CD Driver 2.2.3.0
    CD Driver DLL 2.1.3.1
    Apple Mobile Device 8.0.5.6
    Apple Mobile Device Driver 1.65.0.0
    Bonjour 3.0.0.10 (333.10)
    Gracenote SDK 3.06.0.2770
    Gracenote MusicID 3.06.0.2770
    Gracenote Submit 3.06.0.2770
    Gracenote DSP 3.06.0.2770
    iTunes Serial Number 772513C00B220A08
    Current user is an administrator.
    The current local date and time is 2015-01-29 01:18:49.
    iTunes is not running in safe mode.
    WebKit accelerated compositing is enabled.
    HDCP is supported.
    Core Media is not supported. (16002)
    Video Display Information
    NVIDIA, NVIDIA GeForce GT 630M 
    Intel Corporation, Intel(R) HD Graphics 4000
    **** External Plug-ins Information ****
    No external plug-ins installed.
    **** Device Connectivity Tests ****
    iPodService 12.0.1.26 (x64) is currently running.
    iTunesHelper 12.0.1.26 is currently running.
    Apple Mobile Device service 3.3.0.0 is currently running.
    Universal Serial Bus Controllers:
    Intel(R) 7 Series/C216 Chipset Family USB Enhanced Host Controller - 1E26.  Device is working properly.
    Intel(R) 7 Series/C216 Chipset Family USB Enhanced Host Controller - 1E2D.  Device is working properly.
    Intel(R) USB 3.0 eXtensible Host Controller.  Device is working properly.
    No FireWire (IEEE 1394) Host Controller found.
    Most Recent Devices Not Currently Connected:
    iPod nano running firmware version 1.3.1
    Serial Number: 7L******SZB
    iPhone 4 (GSM) running firmware version 7.1.2
    Serial Number: 68*****QA4S
    iPad (3rd Generation) (Wi-Fi + Cellular) running firmware version 8.1.2
    Serial Number: DYVH******GH
    **** Device Sync Tests ****
    No iPod, iPhone, or iPad found.

  • Just got new ipad2 and can't connect to internet...recognizes wifi network but won't connect

    just got a new ipad2...recognizes wifi network at home, but can't connect to internet...help???

    I just had a similar problem.  Both the ipad 1 and ipad 2 in my household quit connecting to the network even though it seemed to recognize it.  if you think it is recognizing your network, just not connecting, check to see if bluetooth is turned on.  i had to turn bluetooth off and then manually enter the DNS number. 
    My solution also came after I re-started my network and reset all the settings on the ipad2.  The DNS number then showed along with IP submet Mask and router.  I used that dns number to enter into ipad1 after turning bluetooth off on it.
    Totally unscientific fix that may have been more coincidental than correct but you might try it.  BTW--no idea how bluetooth even got turned on to begin with.

  • Can't connect to internet - but all settings seem correct!

    My G5 can't connect to the internet (but my Mac Pro can). I've just had an engineer out because I thought it was the cable connection (I connect via a cable modem). Yet I can ping a host via the Network Utility when I boot from the Tiger DVD - so there doesn't seem to be a hardware problem. But from my user account I can't access the internet.
    All the Network settings look fine - no firewall, nothing looks out of place. I'm getting an IP address served by the modem, and Diagnostics even says it can connect to the ISP server just no dialog with the internet!!! It's bizzare. Tried ping from Terminal too, no go. I've repaired permissions, still no go. Only thing I haven't done is zap the PRAM.
    This is a direct connection to the modem via ethernet (I usually use a router but it's out of the equation now)
    There's something blocking the connection but I can't find out what.
    This happened after I swapped the network round so that my new Mac Pro would be the main internet machine (sharing the connection with other machines on my network). Previously I could connect to the G5 via the Mac Pro but that's no longer working, or rather it's REALLLLLY slow, it will eventually connect.
    The only thing I've done out of the ordinary is put the drive from the G5 inside the Mac Pro to transfer some of my files. I had used BatChmod to change permissions on some User folders so I could copy them, but I've repaired the premissions since.
    please HELP!!!!!!

    I solved my problem by installing a fresh system on a different drive and starting from that. My Mac can now connect - but starting up into the other system causes the same no-internet problem so I can only assume it is some OS corruption that caused it.
    Hope that helps someone.

  • Says can't connect to internet but actually is connected

    I kept getting an error message "Cannot connect to internet" So after going round and round for almost an hour - reseting, reconfiguring network, trying ethernet cable instead of wifi etc. I chose "continue without internet" and bingo it's working now. so I must have a magic ATV that works without internet
    And by the way during all these shenanigans two other computers on the same network were connecting to the router and internet fine.

    Hi vazandrew, thanks for trying to help but actually  the ATV is connected to the internet as I am able to continue watching the show I was watching when it fell. And just to confirm that it is not streaming from any local device, I went and selected a brand new show that I have never watched and it streamed fine.
    So there is something strange going on with my ATV.
    I am listing below the exact sequence of events for you to analyse:
    Watching a show and in the middle of it, it dropped out and some kind of error message came up saying something like "Sorry your show can not continue due to no internet connection" (don't remember what exactly).
    Went over to my macbook and it was still connected fine - opened several new browser pages, refreshed them, etc.- all fine
    Went back to ATV and went to settings > menu > general > network etc. and re-configured but kept getting message something like "you are connected to wi-fi/router GVT-blah blah" (ours) but you have no internet connection.
    Went back and reconfigured network several times,  logged in/out of user account several times but still no joy.
    Went to settings > menu > general > reset all, reconfigured everything to factory default, logged back in, then got the dreaded endless spinning wheel with an eventual message saying something like "could not set date and time"
    Went and changed to configure date /time manually but couldn't find the field to do so so went back and changed back to auto.
    Also changed region from US to Brazil
    Spent about an hour doing all of the above several times and also checked my macbook several times to confirm internet connection was all good, including a speed test.
    Tried ethernet cable connected directly from router to ATV, it showed as connected to router on ATV but still kept giving me message of no internet.
    Disconnected ethernet cable and switched back to w-fi and reset and reconfigured all again but same message saying something like "connected to router, but no internet - continue without internet?
    Finally in desperation, I chose "Continue without internet"
    The screen then went to the Netflix one month free sub option that we subscribed to when we first got the ATV, which I chose and went through the iTunestore account log-in.
    Bingo..all working again supposedly with no internet.
    Finally just to confirm 100% that the ATV is not streaming via another local device, I shut them all down and the ATV is still streamed fine.
    And as I said above, I am able to continue streaming the interrupted show and also chose other Netflix shows that I have never watched before (for now).
    If you ask me, very buggy!

  • Can't connect to Internet and 192.168.1 network at the same time

    I have been having an issue with my MacBook's networking for the past 4 months. Here are the specifics:
    *My MacBook is connected to the Internet via a linux router, with an address in the 192.168.1.x address space. DNS server is an openDns server, 208.67.222.222
    *My MacBook is assigned an IP Address manually in the 192.168.1.x namespace
    *I have a printer manually assigned an address in the 192.168.1.x namespace
    Problem:
    * I can only connect to my printer if I leave my DNS server entry blank under my Airport TCP/IP configuration
    * I can only connect to the Internet when my DNS server entry to set to the openDNS server entry.
    Question:
    Is there any way I can connect to both my local network printer and the Internet at the same time? I have set up two locations that I can switch between, but I would prefer to be able to access both networks at once.

    I tried turning AppleTalk on, but no luck.
    It seems that the problem is related to basic TCP/IP connectivity. For example, when my DNS server is set to blank, I get a fine response from the command "ping 192.168.1.253". However, when my DNS is set to one of the openDNS servers, I get this error:
    PING 192.168.1.253 (192.168.1.253): 56 data bytes
    ping: sendto: No route to host
    ping: sendto: Host is down

  • IPad suddenly can't connect to Internet

    Hey-
    I’ve had my iPad for a few weeks now and love it. It’s been no problem.
    This morning I woke it up to check emails and got a message to say I’m not connected to the Internet.
    The same happened with Safari, and any other Internet based app.
    I shut it down and restarted but that didn’t help. I plugged it into iTunes and saw there was an update available so I installed it in case it helped. But still nothing.
    I have a full signal strength from my wireless router.
    What might be causing the problem?
    Thanks.

    Hi -
    OK - just tried that. It asked me for my router password, and again it connects to the router (I have four bars on my iPad wireless icon); but still when I open an app that requires the Internet it says “You must connect to the Internet to use this application.”
    I know the router is working OK cos I’m connected to it on my desktop Mac in order to write this!
    Any other thoughts?

  • WRT54GS ... Can connect to Internet but not to my network

    I have three desktop computers wired to the router and a laptop that I connect using wireless. One of my computers went to the shop. Now, I can't get it to connect to the network, but I can access the Internet with a browser and with an FTP Client. The other computers still talk to each other fine. I reconfigured the problem desktop but no joy. Note that I cannot access the router at 192.168.1.1 from any computer. I unplugged the router for 30 seconds and replugged it... with no change. What's my next step? Thanks in advance for any help. New info. I can access the router by using Internet Explorer. And There is no light on the front panel indicating that the problem computer is connected ... even though I'm accessing the modem/Internet with it.
    Message Edited by KGP on 09-11-2008 11:31 PM

    Lower down the Ethernet Adapter card speed from Auto to 10 Half Duplex ...
    Also change the cable or the port in the routers back side ....
    See if light is present on one ....

  • Suddenly can't connect to internet even though it's still connected to the network. Why?

    My ios 5.1.1 ipad 3 is less than 1 year old and has been connecting fine in my room. Then suddenly internet stopped working even though it's connected to the network. Tried restarting, forgetting, resetting. It worked for like 1 min randomly, then stopped working again. It only works if I move closer to router. Laptop and another Ipad both work fine. Just don't understand why my ipad stopped working suddenly when it was fine before.

    Yes I do want my problem fix. Thank you for helping.
    I was just wondering why it would be the router when my ipad connects if it's closer to the router and everything seems to be working fine too.

  • Imac can't connect to internet but ethernet working

    Any ideas on how to resolve this, has me baffled. In an office where all other computers can connect but for some reason this imac can't.

    Is the  indicator next to Ethernet in the left Network panel breen or red?  Green should indicate it is enabled. 
    Did you se your IPv4 setting appropriately (probalby DHCP).
    Try using alternate DNS servers such as OpenDNS (208.67.222.222, 208.67.220.220) or google's DNS's (8.8.8.8, 8.8.4.4).  Click the Advanced button, TCP/IP, and renew your lease if you are using DHCP.  Configure IPv6 as Automatically (or off?).  Also make sure all proxies are off.
    For comparison look at the Network settings for one of the machines that is working.
    Finally, is this machine connected to a router that may have its own problems?

  • PC can connect to internet but not time capsule

    We are having no trouble getting onto our internet or accessing the time capsule with our Mac. However, the PC we have can get onto the internet, but is unable to access the time capsule. We need to be able to backup information from both of our computers.
    Please help us!

    Did you install the Airport utility onto windows?  If not do so.. it should include bonjour which helps greatly. Make sure it does.
    TC and wireless names may prevent access to resources.. are your names Apple style with that wonderful apostrophe.. illegal in the windows world?? Spaces in names also not legal.
    Change all names to SMB type.. short .. no spaces.. straight alphanumeric.
    Do you have permissions issues.. ??
    Have you opened file sharing and turned on the guest account.. read and write access.
    Do you have the right workgroup..?
    Please put in WORKGROUP.. assuming that is the workgroup.
    If you still have issues.. are you using homegroup in windows.. well stop it.
    If you still have issues .. are you connecting correctly using proper URL in windows explorer, ie \\TCname or \\TCIPaddress (obviously replacing with actual name or actual IP)
    If you still have issues.. ping the TC by name and IP and turn off all firewalls.
    Do each in turn.. even step 1 might be enough.

  • TS1398 have been connected to my wireless network using a netgear sky broadband router succesfully for a few weeks, suddenly can't connect, network is showing but no signal - all other wireless gadgets are connected just fine - including iphone - any idea

    my ipad 4 has been connected to my wireless network using a netgear sky broadband router succesfully for a few weeks, suddenly can't connect, network is showing but no signal - all other wireless gadgets are connected just fine - including iphone - any ideas?

    Some things to try first:
    1. Turn Off your iPad. Then turn Off (disconnect power cord for 30 seconds or longer) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
    2. Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
    3. Change the channel on your wireless router (Auto or Channel 6 is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
    4. Go into your router security settings and change from WEP to WPA with AES.
    5.  Renew IP Address: (especially if you are droping internet connection)
        •    Launch Settings app
        •    Tap on Wi-Fi
        •    Tap on the blue arrow of the Wi-Fi network that you connect to from the list
        •    In the window that opens, tap on the Renew Lease button
    ~~~~~~~~~~~~~~~~~~~~~~~~~
    iOS 6 Wifi Problems/Fixes
    How To: Workaround iPad Wi-Fi Issues
    http://www.theipadfan.com/workaround-ipad-wifi-issues/
    Another Fix For iOS 6 WiFi Problems
    http://tabletcrunch.com/2012/10/27/fix-ios-6-wifi-problems-ssid/
    Wifi Doesn't Connect After Waking From Sleep - Sometimes increasing screen brightness prevents the failure to reconnect after waking from sleep. According to Apple, “If brightness is at lowest level, increase it by moving the slider to the right and set auto brightness to off.”
    Fix For iOS 6 WiFi Problems?
    http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
    Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
    http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
    How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
    http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
    iOS 6 iPad 3 wi-fi "connection fix" for netgear router
    http://www.youtube.com/watch?v=XsWS4ha-dn0
    Apple's iOS 6 Wi-Fi problems
    http://www.zdnet.com/apples-ios-6-wi-fi-problems-linger-on-7000004799/
    ~~~~~~~~~~~~~~~~~~~~~~~
    How to Fix a Poor Wi-Fi Signal on Your iPad
    http://ipad.about.com/od/iPad_Troubleshooting/a/How-To-Fix-A-Poor-Wi-Fi-Signal-O n-Your-iPad.htm
    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
    WiFi Connecting/Troubleshooting http://www.apple.com/support/ipad/wifi/
    How to Fix: My iPad Won't Connect to WiFi
    http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
    iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
    iOS: Recommended settings for Wi-Fi routers and access points  http://support.apple.com/kb/HT4199
    How to Quickly Fix iPad 3 Wi-Fi Reception Problems
    http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
    iPad Wi-Fi Problems: Comprehensive List of Fixes
    http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
    Connect iPad to Wi-Fi (with troubleshooting info)
    http://thehowto.wikidot.com/wifi-connect-ipad
    Fix iPad Wifi Connection and Signal Issues  http://www.youtube.com/watch?v=uwWtIG5jUxE
    Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
    How To Fix iPhone, iPad, iPod Touch Wi-Fi Connectivity Issue http://tinyurl.com/7nvxbmz
    Unable to Connect After iOS Update - saw this solution on another post.
    https://discussions.apple.com/thread/4010130
    Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
    ~~~~~~~~~~~~~~~
    If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
     Cheers, Tom

  • MacBook can connect to Internet, but not iMac

    Using two Airport Expresses as a WDS network. Had to reset network. Now Network is back up. MacBook can see it just fine and connect to the internet. iMac see's it, but can't connect to internet. I also opened up Airport Utility on iMac and it can't see either airport express...
    Any idea's?

    Also, in network preferences, it shows Airport "Not Connected". But I can see my MacBook on the network.

  • I CANNOT ACTIVATE MY ILLUSTRATOR  AFTER FIXING MY COMPUTER. IT SAIS THAT I AM NOT CONNECTED TO INTERNET BUT I AM. IS THERE ANYBODY WHO CAN HELP.

    I CANNOT ACTIVATE MY ILLUSTRATOR  AFTER FIXING MY COMPUTER. IT SAIS THAT I AM NOT CONNECTED TO INTERNET BUT I AM. IS THERE ANYBODY WHO CAN HELP.

    Sign in, activation, or connection errors | CS5.5 and later
    Mylenium

Maybe you are looking for