Suddenly iMac won't connect to internet yet laptops will

With no changes that I'm aware of my iMac will no longer connect to the internet. When I open Firefox (or Safari) a window pops up telling me Firefox can't connect to my default URL nor any other site I select. I've tried turning airport off and then back on, resetting the wireless router from Verizon (FIOS) and unselecting and reselecting the signal from the router. Strangely this is not happening on my laptop nor my wifes.
iMac is running Tiger, laptops Panther.

Try with this AirPort Utility 5.3.2 for Tiger update.

Similar Messages

IMac won't connect to internet anymore

I've had my iMac for over a year now and rarely had any problems connecting to the internet but now I cannot connect at all. I've read people having similar problems and it may be connected to an update but to be honest I'm not very knowledgable when it comes to this kind of thing so would really appreciate some help.
I connect wirelessly to the internet through my home network which uses a BT Home Hub router. Four other computers (all Windows) also connect and there's usually no problems whatsoever. I turned on my Mac today though and I cannot connect to the internet.
I can connect to my home network, although the connection seemingly keeps going down. However, even when I can stay connected to my home network I cannot connect to the internet. I have had brief periods when I have been able to but websites take absolutely ages to load and the internet connection usually goes down shortly after. None of the other computers on my network are affected, so this problem seems to be isolated to my Mac. Sometimes my Mac can't find any other networks so I have tried turning AirPort off and on again and this usually finds me my home network again but sometimes I cannot connect to it straight away, the connection sometimes times out.
My latest attempt to connect to the internet resulted in me turning AirPort off and on again, connecting to my home network but not finding an IP, then it came up with a self-assigned IP, then it lost connection to the network altogether.
Any help would be greatly appreciated and if any more info is needed I will be happy to give it.

I have exactly the same problem. Have a brand new 27" iMac and can't connect to the internet. A MacBook, MacBook pro, and iPhone have all connected with no problem and continue to do so. Won't access the internet, says password is invalid when I know it isn't, if I manage to get connected (4 times out of about 50 attempts), it throws me out after a few minutes. It doesn't remember the connection settings and I have to go through setup every time I try it.
The signal is strong - I have just tested the connection by trying to connect my mobile phone (Nokia) to the wireless. No problem, instant access, first time. Have spent hours on the phone to Apple and their only conclusion is that it is their wireless card and operation system that is causing the problem and the only solution is to get my internet provider to change the settings on my router.
This is the newest Mac. It retails at £1350! Why can an old phone do what the iMac can't? This is so far from acceptable. I am a new Mac user (the others are my girfriend's and her family's) and if it wasn't for the fact that my girlfriend is such an avid mac fan, I would send this back and buy a pc.
Very unimpressed.

IMac won't connect to Internet after trying to download mac so x

So I was trying to download Mac OS version 10.6.4 (the CD that came with my iMac) and about fifteen minutes in it stopped and restarted. Well I didn't think anything of it because I was late for work as it was. I tried to get on today and my iMac is super slow, it won't connect to the Internet, and IF it does it only stays connected for about 10 minutes. What's wrong? What can I do to fix it on my own, the closes store is two hours away and I really don't want to that?

As we say back home you really screwed the pooch. OK Put your install disk back in and restart the computer while holding down the C key. This will start you up from the disk so you can access Disk utility from the installer program. Click the first aid tab, select your drive and run repair disk.

Imac won't connect to internet

Hello,
My iMac will not connect to the internet correctly. I know the internet is working because my wife is using her laptop wirelessly, and my software updates are still working.
Some pages open, but are corrupted and not laid out correctly, (amazon and BBC News). I have tried to connect wirelessly, and failed. I have emptied the cache and reset safari. I have tried firefox and the same thing has happened.
Any suggestions would be greatly appreciated.
Thanks
Tim

Hello Tim,
Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
Click OK.
Also see if this applies...
About Safari 5.1.7 and Leopard Security Update 2012-003
Summary
Learn about Safari 5.1.7 and Leopard Security Update 2012-003.
Products Affected
Mac OS X 10.5, Product Security, Safari 5.1 (Mac OS X 10.6), Safari 5.1 (OS X Lion)
Safari 5.1.7 for OS X Lion, Safari 5.1.7 for OS X Snow Leopard, and Leopard Security Update 2012-003 disable out-of-date versions of Adobe Flash Player.
Out-of-date versions of Adobe Flash Player do not include the latest security updates and will be disabled to help keep your Mac secure. If Safari 5.1.7 or Leopard Security Update 2012-003 detects an out-of-date version of Flash Player on your system, you will see a dialog informing you that Flash Player has been disabled. The dialog provides the option to go directly to Adobe's website, where you can download and install an updated version of Flash Player.
Additional Information
If you need to re-enable an out-of-date version of Flash Player, you can do the following:
1. Navigate to the /Library/Internet Plug-Ins (Disabled) folder.
2. Drag "Flash Player.plugin" into /Library/Internet Plug-Ins.
3. If the browser is running, quit and restart it.
http://support.apple.com/kb/HT5271

Firefox won't connect to internet but IE will!!

I'm using latest edition of Firefox on windows 07 laptop. Two days ago my internet connection slowed significantly (i was only one) for few hours but then things got to normal. My computer updated (windows) last night and when tried to turn on firefox it won't connect or load website pages. First it said errror in my connection, now message says 'the connection has timed out'. I have done everything stated on firefox support (checked proxy - am on college network so it was on auto and I switched it to no proxy - no luck), I checked my firewall (managed by mcafee) and even though windows is not being used on my laptop I added firefox just in case - no luck. I did the other steps on the page - no luck. IE is working fine and at reasonable speed so it's not the connection.
Any help would be greatly appreciated!!
Edit: don't know if this may help but googlechrome won't work for me either - it opens, and tries to connect to page but never does. . .

[[https://support.mozilla.com/en-US/kb/Cannot%20connect%20after%20upgrading%20Firefox?s=cannot+connect+after+upgrading+firefox&as=s]]
For me the problem was McAfee Security Center running on Windows 7. I reset McAfee and Firefox connected again.

IMac won't connect to internet, but can on internal network

Hi,
I've tried resetting the router and various other things that I found on the internet. I know its not a router problem as I am using my MBP to post this discussion. It won't even connect to the router's internap page. Any thoughts?

With the iMac failing to open any web page outside of your network, then I would be checking the DNS setting in System Preferences > Network > Wifi > Advanced. Compare what you have here to what the MBP has set.
But with the iMac also failing to connect to the routers internal web page then you've got additional problems beyond DNS. Using the MBP as a reference, if you make a note of the TCP/IP network settings in the Advanced section as shown above, is the iMac using the same? (apart from the IP address which should have the last number set to a different value).

Express won't connect to internet, yet shows full signal

I have just had BT infinity installed last week every thing was working fine but i wanted to replace a very old telephone extension cable from my BT walk socket at the other end of my flat to a really good quality ADSL cable which would plug in to my Draytek Vigor 130 modem which then links into a time capsule, i then have an airport express and an airport extreme (in bridge mode) to extend my Wifi coverage. Bt infinity worked fine until i replace the ADSL cable but why do the routers now say there is full bars yet cannot connect to the internet? Can anyone help???

Ok, with the Draytek performing basic modem functions, you will want to leave the Time Capsule in router mode.
We can now add the other two base stations, one at a time, to extend the Time Capsule's Wi-Fi network. Again, I would recommend that you perform a "factory default" reset on both of these base stations. For each base station, you will want to determine the ideal location for extending the TC's signal. Please refer to the following AirPort User tip for details on station placement. This tip is best performed using a Mac laptop. Note: Be sure that only the Time Capsule is operating while taking the SNR measurements as you only want to know its signal quality at the location you plan on placing the extending base station. You may find their current location is not ideal using this tip.
Once you determined the best location for each extending base station bring both to the same room that you have the Time Capsule. I would then recommend that you use the "automated" setup within the AirPort Utility to configure each for an extended network one at a time. Verify that network is extended before going on to configure the second base station. Finally, after each base station has been verified, move them to the locations that you determined using the tip.

My new iMac won't connect to internet, will connect to network.

I have a 3 week old 2012 27-inch iMac and this morning I turned it on and it wouldn't connect to the internet. It connected to my home network just fine, just not the internet. I assumed it was my router's fault, but every other device in the house connected to the internet just fine. I have already tried turning it off and on again, many times, as with my router. I have also tried turning the Wi-Fi off and on in System Preferences. Any help?

System Preferences>Network
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
http://docs.info.apple.com/article.html?artnum=106748 Mac OS X: Troubleshooting a dial-up/PPP Internet connection
http://docs.info.apple.com/article.html?artnum=106749 Troubleshooting a cable modem, DSL, or LAN Internet connection
http://support.apple.com/kb/HT1714 Solutions for connecting to the Internet, setting up a small network, and troubleshooting
BTW: Which OS are you using?

Admin user account won't connect to internet - but guest will.

I'm having a very strange problem with my imac. When I am signed in using my normal admin account, the internet won't work. Or if it does it is brutally slow. And as long as I have the my computer plugged into the internet... whether it be ethernet or wifi, no one else in my house can connect to the internet either, or it's brutally slow as well. The second I unplug the ethernet cable from the back of my computer, everyone else's computer on my home network works perfectly.
The only way I can avoid this problem is to sign on to my imac with the guest account, in which case the internet works fine on my computer and everyone else's. Does anyone know how to fix this? I really don't want to just start using the guest account... I am a photographer and all my info, apps, etc. I use for my business are in my normal admin account. Any help will be much appreciated. Thanks, Beverly
I am running Lion 10.8.5

This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve your problem.
If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
Below are instructions to run a UNIX shell script, a type of program. All it does is to gather information about the state of your computer. That information goes nowhere unless you choose to share it on this page. However, you should be cautious about running a program at the instance of a stranger on a public message board. If you have doubts, search this site for other discussions in which this procedure has been followed without any report of ill effects. If you can't satisfy yourself that the instructions are safe, don't follow them.
Here's a summary of what you need to do: Copy a line of text from this web page into the window of another application. Wait about a minute. Then paste some other text, which will have been copied automatically, back into a reply on this page. The sequence is: copy, paste, wait, paste again. Details follow.
You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.
If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can't log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
The script is a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, though you may not see all of it in your browser, and you can then copy it. If you try to select the line by dragging across the part you can see, you won't get all of it.
Triple-click anywhere in the line of text below on this page to select it:
clear; shopt -s extglob; Fb='%s\n\t(%s)\n'; Fm='\n%s:\n\n%s\n'; Fs='\n%s: %s\n'; Fu='user %s%%, system %s%%'; PB="/usr/libexec/PlistBuddy -c Print"; A () { [[ a -eq 0 ]]; }; R () { o=; [[ r -eq 0 ]]; }; Pm () { [[ "$o" ]] && o=`sed 's/^ */ /' <<< "$o"` && printf "$Fm" "$1" "$o"; }; Pc () { o=`egrep -v '^[[:blank:]]*($|#)' "$2"`; Pm "$1"; }; Pp () { o=`$PB "$2" | awk -F'= ' \/$3'/{print $2}'`; Pm "$1"; }; Ps () { o="${o##+( )}"; [[ ! "$o" =~ ^0?$ ]] && printf "$Fs" "$1" "$o"; }; id | grep -qw '80(admin)'; a=$?; A && sudo true; r=$?; t=`date +%s`; clear; { A || echo $'No admin access\n'; A && ! R && echo $'No root access\n'; system_profiler SPSoftwareDataType | sed '8!d;s/^ *//'; o=`system_profiler SPDiagnosticsDataType | sed '5,6!d'`; [[ "$o" =~ Pass ]] || Pm "POST"; o=`pmset -g therm | sed 's/^.*CP/CP/'`; egrep -q 'No th|pms' <<< "$o" && o=; Pm "Thermal conditions"; o=`pmset -g sysload | grep -v :`; grep -q '= [^GO]' <<< "$o" || o=; Pm "System load advisory"; o=`nvram boot-args | awk '{$1=""; print}'`; Ps "boot-args"; d=(/ ""); D=(System User); for i in 0 1; do o=`cd ${d[$i]}L*/L*/Dia* && ls *.{crash,hang,panic} | tail | awk -F_ '{$NF=a[split($NF,a,".")]; print}'`; Pm "${D[$i]} diagnostics"; done; o=`syslog -F bsd -k Sender kernel -k Message CReq 'GPU |hfs: Ru|I/O e|n Cause: -|NVDA\(|pagin|SATA W|ssert|timed? ?o' | tail -n25 | awk '/:/{$4=""; $5=""; print}'`; Pm "Kernel messages"; o=`df -m / | awk 'NR==2 {print $4}'`; [[ o -lt 5120 ]] && Ps "Free space (MiB)"; o=$(($(vm_stat | awk '/eo/{sub("\\.",""); print $2}')/256)); o=$((o>=1024?o:0)); Ps "Pageouts (MiB)"; s=( `sar -u 1 10 | sed '$!d'` ); [[ s[4] -lt 90 ]] && o=`printf "$Fu" ${s[1]} ${s[3]}` || o=; Ps "Total CPU usage" && { s=(`ps acrx -o comm,ruid,%cpu | sed '2!d'`); o=${s[2]}%; Ps "CPU usage by process \"$s\" with UID ${s[1]}"; }; s=(`top -R -l1 -n1 -o prt -stats command,uid,prt | sed '$!d'`); s[2]=${s[2]%[+-]}; o=$((s[2]>=25000?s[2]:0)); Ps "Mach ports used by process \"$s\" with UID ${s[1]}"; o=`kextstat -kl | grep -v com\\.apple | cut -c53- | cut -d\< -f1`; Pm "Loaded extrinsic kernel extensions"; R && o=`sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix\.cron)|org\.(amav|apac|calendarse|cups|dove|isc|ntp|post[fg]|x)/{print $3}'`; Pm "Extrinsic system jobs"; o=`launchctl list | sed 1d | awk '!/0x|com\.apple|org\.(x|openbsd)|\.[0-9]+$/{print $3}'`; Pm "Extrinsic agents"; for d in {/,}L*/{La,Priv,Sta}*; do o=`ls -A "$d" | egrep -v '^(\.DS_Store$|com\.apple\.)'`; Pm "$d"; done; o=`find -L /S*/L*/E* {/,}L*/{A*d,Compon,Ex,In,Keyb,Mail,P*P,Qu,Scripti,Servi,Spo}* -type d -name Contents -prune | while read d; do ID=$($PB\ :CFBundleIdentifier "$d/Info.plist") || ID="No bundle ID"; egrep -qv "^com\.apple\.[^x]|Accusys|ArcMSR|ATTO|HDPro|HighPoint|driver\.stex|hp-fax|\.hpio|JMicron|microsoft\.MDI|print|SoftRAID" <<< $ID && printf "$Fb" "${d%/Contents}" "$ID"; done`; Pm "Extrinsic loadable bundles"; o=`find /u*/{,*/}lib -type f -exec sh -c 'file -b "$1" | grep -qw shared && ! codesign -v "$1"' {} {} \; -print`; Pm "Unsigned shared libraries"; o=`launchctl getenv DYLD_INSERT_LIBRARIES`; Pm "Inserted libraries"; o=`find {,/u*/lo*}/e*/periodic -type f -mtime -10d`; Pm "Modified periodic scripts"; o=`scutil --proxy | grep Prox`; Pm "Proxies"; o=`scutil --dns | awk '/r\[0\] /{if ($NF !~ /^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./) print $NF; exit}'`; Ps "DNS"; R && o=`sudo profiles -P | grep :`; Pm "Profiles"; for f in fstab sysctl.conf crontab launchd.conf; do Pc $f /etc/$f; done; Pc "hosts" <(grep -v 'host *$' /etc/hosts); Pc "User launchd" ~/.launchd; R && Pc "Root crontab" <(sudo crontab -l); Pc "User crontab" <(crontab -l); R && o=`sudo defaults read com.apple.loginwindow LoginHook`; Pm "Login hook"; Pp "Global login items" /L*/P*/loginw* Path; Pp "User login items" L*/P*/*loginit* Name; Pp "Safari extensions" L*/Saf*/*/E*.plist Bundle | sed 's/\..*$//;s/-[1-9]$//'; o=`find ~ $TMPDIR.. $ -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 $ | wc -l`; Ps "Restricted user files"; cd; o=`system_profiler SPFontsDataType | egrep "Valid: N|Duplicate: Y" | wc -l`; Ps "Font problems"; o=`find L*/{Con,Pref}* -type f ! -size 0 -name *.plist ! -exec sh -c 'plutil -s "$1" >&-' {} {} \; -print`; Pm "Bad plists"; d=(Desktop L*/Keyc*); n=(20 7); for i in 0 1; do o=`find "${d[$i]}" -type f -maxdepth 1 | wc -l`; o=$((o<=n[$i]?0:o)); Ps "${d[$i]##*/} files"; done; o=$((`date +%s`-t)); Ps "Elapsed time (s)"; } 2>/dev/null | pbcopy; exit 2>&-
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Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
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Click anywhere in the Terminal window and paste (command-V). The text you pasted should vanish immediately. If it doesn't, press the return key.
If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. In most cases, the difference is not important.
If you're not logged in as an administrator, you won't be prompted for your password. The test will still run. It just won't do anything that requires administrator rights.
The test may take up to a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. There is no indication of progress until it's done. Wait for the line "[Process completed]" to appear in the Terminal window. If you don't see that line within half an hour or so, the test probably won't complete in a reasonable time. In that case, close the Terminal window and report your results. No harm will be done.
When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.
If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.
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Note: This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.
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Safari, iTunes, iMail, etc... won't connect to internet but FireFox will?

All of my apple applications that use Safari to connect to the internet won't. If I want to connect to the internet I have to use Firefox. I am using a Cisco Linksys Dual Band Wireless N Gigabyte Router with it. My apple my ipod touch which uses safari also will not connect to the internet. This is extremely annoying since I can no longer download anything from iTunes on my iMac or ipod Touch.

I have this problem also. I hope someone out there is reading that can help troubleshoot. When Mail and Safari quit I can still use Firefox. unplugging the network cable and plugging it back in fixes it temporarily. It happens at least twice a day.

Safari won't connect to internet but firefox will

I just set up a home wifi network. Firefox v 22 works perfectly. However itunes store in itunes fails to open. I also just get a blank screen in Safari with no connectivity to the internet. No address I type into the browser bar generates ANY response. Chrome aso works just fine as a browser, so internet connectivity is NOT an issue. Any ideas on a fix to allow these two Apple products to work?

Back up all data.
From the menu bar, select
 ▹ System Preferences ▹ Network
If the preference pane is locked, click the lock icon in the lower left corner and enter your password to unlock it. Then click the Advanced button and select the Proxies tab. If any proxy options are selected, make a note of them and then deselect them. You don’t need to change the bypass or FTP settings. Click OK and then Apply. Test. The result may be that you can't connect to any web server. Restore the previous settings if that happens.

IMac won't connect to the to the wireless network and internet when a laptop is connected

When a windows laptop is connected wirelessly to my router and the internet my Imac won't connect. If the Imac is connected wirelessly first it turns off when I connect the laptop. the iMac has once given me a message about the laptop using the same IP address. Can anyine help, I have been putting up with this for a year now and it's a real pain. Any help appreciated Many thanks
Joel

Check the company that you get your internet service from. High speed internet through a phone service modem allows for one connection as the modem is controlling the IP addresses. If you add a wireless to this connection, your modem will still allow for only one connection at a time. The wireless modem should be "in charge". Call the internet service provider and see if they will walk you through how to give permission to your wireless to assign IP addresses and not the modem they supplied.
If your Mac and PC both want the same address, you can tell your Mac to use a manual IP address. Go to:
system preferences/network
write down the IP address, subnet mask, and router numbers. On dropdown Configure IPv4 choose "using DHCP with manual address". Now put back in all the numbers you wrote down except in the IP address box, change the last digit to a higher or lower number.
Now the PC will be happy with the IP it chose and the Mac will, also.

My iMac won't connect to my network

My iMac won't connect to the internet anymore. I can only get internet connection through someone elses network.
It connected okay to my network when I first plugged it in. Everything was coming up roses and such. I'm thinking though it might have something to do with my pc. I gave my mom my pc and cleaned off everything. After re-installing the drivers, programs, and re-installing the wireless info on the pc, my mac won't connect to the network
There is a password for connecting to the network a wep 128. But my mac keeps telling me the password is wrong. And the only way to connect to the interent for me is via the Dlink connection.
We have a Linksys Wireless Router (WRT54G)
My mom has windows XP with wireless capability
My mac has the airport extreme already in the computer
I'm sure the problem is something really simple and minor and that I will kick myself for not figuring it out. :S
But any help would be great
iMac Mac OS X (10.4.8)

The only other connection I get is through a unsecured dlink.
I tried using network assistant to get on the linksys network but when I put in the password for it I keep getting a message that says invalid.

Won't Connect to Internet Via Browser

I have tried all I know. My iMac won't connect to the internet via browsers. AirPort Utilities says it's a good connetion. Network Diagnostics says it is working properly. So why are all

What happens when you try to connect?

My iMac won't connect to Wi Fi automatically ?

My iMac won't connect to Wi Fi automatically ?

Hello, how do you fetit to connect?
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
Instead of joining it from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.

Suddenly iMac won't connect to internet yet laptops will

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