AirPort doesn't have a Valid IP Address after Moving

After moving to a new apartment, I've been having a lot of trouble with my AirPort.
At first, only my computer was able to connect, even though I kept getting warnings that it didn't have a valid IP address. No other devises, including other computers, were able to connect. Throughout this entire time, the airport light blinked yellow. Then, all of a suddent, the airport light went solid green, and now I can't even connect wirelessly. I've had a tech savy friend look at it, and I also tried a hard reset. Nothing works.
My building provides us with internet, including the Motorola modum (SBV5330 SURFboard) in my room. Under networks, it says my SirPort is connected and has the IP address of 10.0.1.3.
Can somebody help me?

jschenmd wrote:
able to reach ISP support who made me aware that the IP address is purposely set for one router so can't be changed out without their involvement.
So your ISP has chosen to throw you into the "worst case" situation I mentioned above. I don't know why ISPs do that. If nothing else, it increases their support costs.
He also convinced me to keep the linksys router stating that it was still an excellent device and unmatched in quality. So, I guess I won't be changing to Airport! Any disagreement or benefit of the Airport over a linksys broadband router model wrt54gl v1.1 other than my being a fan of Apple products?
I have no experience with Linksys equipment, but I suspect that it's no better or worse than most. I also suspect that the support people at your ISP are guilty of recommending only what they know.
If you already have that AirPort Extreme base station, I'd tell those people to stop jerking you around and update their configuration to let you use it.

Similar Messages

"ethernet doesn't have a valid ip configuration"

Hi
I use an apple time capsule as a wifi router. It is wired to two other airport express routers to extend the range.
Everything has been working fine for months, but I shut down my PC (Windows 8.1) on Friday and started it up on Monday. On Friday I could connect to the internet in the normal way. On Monday it's not working.
I have told Windows to forget the network, then I connected to it again with the correct password. I get an error message "Ethernet doesn't have a valid IP configuration". I have also tried connecting using an ethernet cable but get the same result. I have checked my IPV4 and IPV6 settings to make sure that the IP address is obtained automatically, which they were and are.
There are many other devices currently connected to the wireless network and they are working fine (another windows PC, ipad, iphone). It is just this one PC that cannot connect.
To be clear, the PC was not turned on between Friday and Monday. This issue has just happened. It's possible that another device joined the network over the weekend so could the time capsule be "full" somehow?
I have tried turning the time capsule off and on, and also the internet router. And reset my PC's network adapter, and restarted twice already. Without any luck.
Would appreciate some help!

OK, have just "solved" this somehow. Having forgotten the network I was then entering the wrong wifi password. When I put the correct one in, I can connect to the network and use the internet.
The weird thing is that I never got an error message before telling me it was the wrong password. It appeared to be connecting. Also the ethernet connection should have worked surely, as that doesn't need any code.

Time Capsule does not have a valid IP address

We have 2 computers in our home office: a Win 7 desktop and an iMac.
We have cable internet; the cable modem (Toshiba PCX2500) is plugged (ethernet) directly into the Time Capsule, which we use as our router to the two computers (also by ethernet).
The wireless functionality of the Time Capsule has been turned off.
We’ve been using the Time Capsule like this for the past 18 months (we purchased it new) without any problems.
Last month, however, we began losing our internet connection regularly (about 3-4 times per day) and getting the dreaded golden flashing light (as opposed to solid green) along with the error (paraphrasing here) “the Apple Wi-Fi does not have a valid IP address.”
We hadn’t made any changes in our hardware; it just showed up out of the blue.
After contacting our ISP, we were advised to unplug the cable modem for about 30 seconds, then plug it back it. Most of the time this worked; if not, we had to “cycle” the Time Capsule as well.
We’re now having to do this about 4-5 times per day.
Sometimes the Time Capsule’s status light is still green when we have no internet connection. Out of the blue the connection just isn’t there.
We “cycle” the cable modem and we’re back in business every time.
Additionally, when we actually do have an internet connection, the speeds fluctuate wildly. We’re paying for 15 Mb service; as of the past 4-5 weeks, we get 15Mb about 50% of the time. The other 50% it generally averages between 3Mb and 6Mb.
The ISP’s tech support (we’ve contacted them no less than once a week since this started) swears up and down that it’s the router, not their signal or their equipment in any way. They deny all culpability.
We even had the ISP’s repair people come out on an occasion about 10 days ago to test the signal strength; they reported no problems. “You’ve got great signal strength to your home…” were the exact words.
Similarly, after calling Apple on 2-3 occasions, we get the exact same response: “It’s not the Time Capsule router, it’s your ISP.”
The last Apple technician we spoke with (yesterday) said, “I’ve been doing wireless/Internet tech support for years and I can guarantee you – 100% -- that it’s a ‘DNS caching’ issue. I’m 100% positive that’s your problem, and I’m also 100% positive it’s your ISP’s fault.”
After contacting the ISP again we were informed that they don’t have any such caching problems.
We’re tired and frustrated! Please help.

I would suggest running the network via a pc for the day.. pick either your Mac or win7 pc.. you will need to do a bit of fiddling.. even better would be to just borrow a router. Or buy one on a 7day return .. !! Beg borrow.. don't steal. Just get a router other than TC. it won't take long to determine if the TC is the issue.
IMO at 18months you are suffering failure of the TC power supply. early days but it is showing signs of delinquency. And will get worse. But another router will show it up.. if the PC has dual ethernet cards you can run ICS.. or same sort of thing on the imac to the wireless .. ie the PC or Mac becomes the router with direct connection to the cable modem. Then share internet from there.
Once you do that for a day or two, you will quickly be able to track down if the issue is cable service/modem or the TC as router.

I have change e-mail address after first registration and when I logged in it send new password to my old e-mail address. now I can't use my old profile

I have change e-mail address after first registration and when I logged in it send new password to my old e-mail address. now I can't use my old profile.
and I can't install my old adobe X anymore
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Change Account https://forums.adobe.com/thread/1465499 may help
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Airport Extreme does not have a valid IP address

My Airport Extreme Base Station 802.11N (AEBS) no longer has an internet connection and I cannot share internet or even access the internet via an ethernet cable from the AEBS to my iMac unless in Bridge mode. I have a 2.6 Ghz Intel Core iMac running OS X 10.5.6. I also have an Airport Express (802.11b/g) currently offline.
When I plug my ethernet cable directly into the iMac I've got a fast and reliable internet connection. I have also done 2 hard resets on my AEBS without any success. I have ensured that my cables are properly plugged in and had it checked by another person.
I do not have a specific IP address from my Internet Service Provider (ISP). I have contacted my ISP and have confirmed that there is nothing wrong on their end. I had an internet connection previously with "Using DHCP". Now when I select it blanks out the IP address box. I referred to my last working saved Airport setting and my AEBS still does not have an internet connection.
I'm not sure what else I can do. Any help would be appreciated. Thanks in advance.
Byron

Hello,
I'm having a similar problem. Saturday morning my Comcast Internet was gone. I went through all the steps to troubleshoot (powering everything down, checking connections, powering back up from outside, connecting directly to the cable modem via Ethernet, etc.). I only got a valid IP address for a brief few minutes when directly connected. Comcast swapped out my modem, but same issue. Then Sunday they said known problem in area. This morning I got on the line with a level 2 tech. We went through just about everything again, and I can connect very reliably via direct Ethernet connect to modem. If I unplug the ethernet and give it a minute to recognize its gone, ip address goes blank. When I plug it back in, it gets a valid IP address and Internet connects almost instantaneously.
However, with my AEBS (n) I can't get a valid IP address. I use the exact same Ethernet cable from the cable modem the AEBS Internet WAN port. But it gives itself a self-assigned IP of 169.254... I've gone through the cycles of powering down and back up a couple of times, checked my connections several times, and reset my AEBS to factory defaults. Still no dice. Internet is set to DHCP and to share a public IP address (in the default 10.0.1.x ranges). Has my AEBS effectively lost its ability to get a valid IP from the modem? Is it dead? Anything you can think of that I can try?

I got my mac stolen in the airport.doesn it have a tracking device?

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It has find my Mac installed, but you would need to activated the tracking in your iCloud settings. Try logging into your iCloud account then click on find my iPhone icon you may be able to track it, if it is connected to a wifi network. Also change your iTunes password as soon as possible. http://www.apple.com/support/icloud/find-my-device/

Change email address on printer to new address after moving.

HP Officejet Pro 8500A, Model #A910A Printer Product # CM756A
I have moved, have a new email address and I cannot find how to set my email address on the printer.
Using Mac OS Lion. Can print and scan and fax back to computer, but not send an email directly from the printer (with the scanned document attachment) I have gone into the set up countless times to try to change the outgoing email profile via HP Direct digital filing and the web site is constantly blank, goes nowhere., same for setting up HP digital fax. This is being done from the utility set up area in the web embedded server. This is the message I get:
You will be redirected to a secure (HTTPS-enabled) page.
If you encounter a message about an invalid security certificate, follow the instructions displayed to accept the certificate; you may be prompted to click Continue or OK (or a similar button or link). There is nothing here and is just a dead end.

It sounds like you are getting the prompt to click OK to be redirected to the HTTPS site, but you are not getting anythign after clicking ok.
You could try refereshing the page until it loads (it may take several tries) or try using a different browser.
The secure section of the EWS is not a true site on the Internet and it has a certficate that isn't really registered since it is not accessible outside of your network. Browsers can have an issue with this sometimes.
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"Your airport device does not have a valid IP address"

Hello,
Hoping someone can be kind enough to help here, please let me know if I haven't provided enough details or in the wrong format as I'm not hugely technical.
I have recently bought an Airport Express to connect to my existing Wi-Fi network. I have a Netgear DG834G v4 router-modem-base-station-thing and there are two computers running Windows 7 that connect to this.
I set up the connection via the Airport Utility and updated the firmware to 7.5.2 and everything worked beautifully for the first ten days or so. All the Airport Express was doing was linking my stereo to itunes and playing music.
One morning though the orange light was flashing on the Airport Express and when I opened up the Airport Utility I got the message in the title. I have tried re-setting via the Airport Utility and pressing the button on the unit itself, but all to no avail, the same error comes up when I have re-set the equipment from the default. Can anyone point me in the right direction to get things running smoothly again please?
Lastly, as far as I am aware I can't use the airport express as a bridge for my Netgear router (as this only works for extending the range of an apple product) but please let me know if I'm wrong!
Many thanks in advance!

An update for anyone who may have similar problems as this is now resolved for me. Largely by accident I found out the problem was actually with my main router as opposed to the Airport Express unit.
Can't explain why but unplugging the Netgear router from the power supply in the wall for five minutes or so (to do the vacuuming in this case!) and then plugging it back in and powering back up (this took some time (15 minutes or so) appeared to allow the router to sort what needed which IP address.
This happened about 2-3 weeks ago and everything has been running fine since. Please note that I did try and "soft" re-set the router by telling it to re-set via the settings you can alter using a web browser but this had no effect at the time.

Time Capsule blinks yellow,when I go to airport utility to set up, it Says This apple wi-fi bse station doesn't have any DNS server addresses and might have trouble connecting to internet. My internet works, but I can't back up anything. What do I do??

Worked fine for about a couple of weeks after my son -law installed the time capsule. I can access the Internet both from my wife's I phone and from my desktop. I think that I need to get the DNS server numbers and put them in the two blanks; but where do I get them? Thanks, Jim

If the modem is also a router, either use the modem in bridge and run pppoe client on the TC.. that is assuming ADSL or similar eg vdsl. If it is cable service.. and the modem is a router, then bridge the TC.. go to internet page and select connect by ethernet and below that set connection sharing to bridge.
Please tell us more about the modem if the above gives you issues.

My Airport base station has a status message that says "This AirPort base station doesn't have any DNS server addresses and might have trouble connecting to the internet." What does this mean and how can I fix it?

My internet is still working, but it's very intermittent. This happened after I updated the firmware a few days ago.

Did you remember to completely power cycle the entire network?
You would want to do this after any update or change to the network.
If you did not do this yet......things are out of sequence.
Power off everything on the network.....all devices.....power down order is not important
Wait a few minutes
Start the modem first and let it run a minute or two by itself
Start the next device connected to the modem the same way
Work your way out on the network starting each device about a minute apart
Check the network

Firefox continues to warn me that the web site I am using does not have a valid certificate, even after I have repeatedly created an exception for this website

The site is an https secure site that I normally visit with IE, however parts have become inaccessible to me on one particular computer that I use for an unknown reason...( Vista sp2)
I decided to try Firefox and it works well, except for the annoying reminder every time I try and log in to the website that its security certificate is invalid...

I would suggest running the network via a pc for the day.. pick either your Mac or win7 pc.. you will need to do a bit of fiddling.. even better would be to just borrow a router. Or buy one on a 7day return .. !! Beg borrow.. don't steal. Just get a router other than TC. it won't take long to determine if the TC is the issue.
IMO at 18months you are suffering failure of the TC power supply. early days but it is showing signs of delinquency. And will get worse. But another router will show it up.. if the PC has dual ethernet cards you can run ICS.. or same sort of thing on the imac to the wireless .. ie the PC or Mac becomes the router with direct connection to the cable modem. Then share internet from there.
Once you do that for a day or two, you will quickly be able to track down if the issue is cable service/modem or the TC as router.

Why doesn't my disk space free up after moving files to an external drive?

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I am looking at the free space in Finder > Get Info.
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Have a look Here...
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My 3g 16mb damaged by water now works except connecting to internet. Have no account for it after moving to my 3GS. Can this phone be used again?

I want to sell the phone since every test done shows it to be working after two years of drying out.The only service not working is connecting to the Internet. That i believe is caused by transferring AT&T account to new iPhone. Is there any test of older iPhone to see if it can connect to the Internet?

Amazing to see that the iPhone with the SIM card from my new iPhone worked good. The only problem I had was with AT&T. Somehow they got the idea I had set up a new account and starting charging me for that instead of continuing with my old one. After talking to them, that problem was taken care of.
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Constant disconnects with "no PPPoE" and "no valid IP address" errors

I have AT&T DSL and have an Airport Extreme connected to a Speedstream 4100 modem. My Internet connection has been fine for nearly a year with the AEBS but for the past couple weeks has been disconnecting so frequently that it's almost become useless. The problems reported by the AEBS are: PPPoE Server (no PPPoE server found) and Internet Connection (AEBS doesn't have a valid IP address). It's always these two problems reported.
Restarting the AEBS gets me connected again, and sometimes the connection will come back on its own, but only for a short while. I don't know how to troubleshoot this. Help! Here are my AEBS settings:
Radio Mode: Automatic
Radio Channel Selection: Automatic
Wireless Security: WPA2 Personal
Use wide channels: Checked
Create a closed network: Checked
Use interface robustness: Unchecked
Sorry, I'm not a network guy so forgive me if I've omitted some important information. Below the log from a recent bout of connects and disconnects:
Jun 19 10:04:06 Severity:5 Disconnected.
Jun 19 10:04:09 Severity:5 Binding added for udp, 0.0.0.0:32816 to 10.0.1.4:5353 with lifetime 7200
Jun 19 10:04:09 Severity:5 Binding dropped for udp to 10.0.1.4:5353
Jun 19 10:06:40 Severity:5 Binding added for udp, 0.0.0.0:32817 to 10.0.1.4:5353 with lifetime 7200
Jun 19 10:06:40 Severity:5 Binding dropped for udp to 10.0.1.4:5353
Jun 19 10:07:37 Severity:6 Parameter updated - drTY.
Jun 19 10:07:37 Severity:5 unloading current configuration.
Jun 19 10:07:47 Severity:5 Connecting via ethernet (user "[email protected]" service "AT&T DSL Connection").
Jun 19 10:07:47 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 3).
Jun 19 10:07:47 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 2).
Jun 19 10:07:47 Severity:5 Rotated CCMP group key.
Jun 19 10:07:47 Severity:3 No Address for NTP server time.apple.com.
Jun 19 10:07:52 Severity:5 (WAN) link state is Up.
Jun 19 10:07:57 Severity:5 Associated with station 00:16:cb:00:ee:34
Jun 19 10:07:57 Severity:5 Installed unicast CCMP key for supplicant 00:16:cb:00:ee:34
Jun 19 10:08:02 Severity:3 No Address for NTP server time.apple.com.
Jun 19 10:08:04 Severity:5 Associated with station 7c:6d:62:a2:dc:0c
Jun 19 10:08:04 Severity:5 Installed unicast CCMP key for supplicant 7c:6d:62:a2:dc:0c
Jun 19 10:08:06 Severity:5 Connection accepted from [::ffff:10.0.1.2]:61426.
Jun 19 10:08:08 Severity:5 Connection accepted from [fe80::216:cbff:fe00:ee34%bridge0]:61428.
Jun 19 10:08:08 Severity:5 Connection accepted from [fe80::216:cbff:fe00:ee34%bridge0]:61427.
Jun 19 10:08:13 Severity:5 Associated with station 00:24:36:90:4e:f6
Jun 19 10:08:13 Severity:5 Installed unicast CCMP key for supplicant 00:24:36:90:4e:f6
Jun 19 10:08:17 Severity:3 No Address for NTP server time.apple.com.
Jun 19 10:08:18 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 10:08:18 Severity:5 Binding added for udp, 0.0.0.0:32769 to 10.0.1.4:5353 with lifetime 7200
Jun 19 10:08:19 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 10:08:20 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 10:08:22 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 10:08:26 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 10:08:27 Severity:5 Connection established xxx.xxx.xxx.xxx -> 151.164.187.11.
Jun 19 10:08:28 Severity:5 Binding added for udp, xxx.xxx.xxx.xxx:32769 to 10.0.1.4:5353 with lifetime 7200
Jun 19 10:08:32 Severity:5 Binding dropped for udp to 10.0.1.4:5353
Jun 19 10:08:32 Severity:5 Clock synchronized to network time server time.apple.com (adjusted +0 seconds).
Jun 19 10:09:09 Severity:5 Disconnected.
Jun 19 10:11:32 Severity:5 Initialized (firmware 7.4.2).
Jun 19 10:11:34 Severity:5 Connecting via ethernet (user "[email protected]" service "AT&T DSL Connection").
Jun 19 10:11:35 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 3).
Jun 19 10:11:35 Severity:3 No Address for NTP server time.apple.com.
Jun 19 10:11:35 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 2).
Jun 19 10:11:35 Severity:5 Rotated CCMP group key.
Jun 19 10:11:35 Severity:5 Connection established xxx.xxx.xxx.xxx -> 151.164.187.11.
Jun 19 10:11:39 Severity:5 (WAN) link state is Up.
Jun 19 10:11:45 Severity:5 Connection established xxx.xxx.xxx.xxx -> 151.164.187.11.
Jun 19 10:11:45 Severity:5 Associated with station 00:16:cb:00:ee:34
Jun 19 10:11:45 Severity:5 Installed unicast CCMP key for supplicant 00:16:cb:00:ee:34
Jun 19 10:11:50 Severity:5 Clock synchronized to network time server time.apple.com (adjusted +5 seconds).
Jun 19 10:11:50 Severity:5 Associated with station 7c:6d:62:a2:dc:0c
Jun 19 10:11:50 Severity:5 Installed unicast CCMP key for supplicant 7c:6d:62:a2:dc:0c
Jun 19 10:11:52 Severity:5 Connection accepted from [fe80::216:cbff:fe00:ee34%bridge0]:61481.
Jun 19 10:11:53 Severity:5 Connection accepted from [fe80::216:cbff:fe00:ee34%bridge0]:61483.
Jun 19 10:11:54 Severity:5 Connection accepted from [fe80::216:cbff:fe00:ee34%bridge0]:61484.
Jun 19 10:11:55 Severity:5 Associated with station 00:16:cb:00:ee:34
Jun 19 10:11:55 Severity:5 Installed unicast CCMP key for supplicant 00:16:cb:00:ee:34
Jun 19 10:12:02 Severity:5 Associated with station 00:24:36:90:4e:f6
Jun 19 10:12:02 Severity:5 Installed unicast CCMP key for supplicant 00:24:36:90:4e:f6
Jun 19 10:12:08 Severity:7 Public address reported as xxx.xxx.xxx.xxx to 10.0.1.4:5353
Jun 19 10:12:08 Severity:5 Binding added for udp, xxx.xxx.xxx.xxx:32769 to 10.0.1.4:5353 with lifetime 7200
Jun 19 10:12:08 Severity:5 Binding dropped for udp to 10.0.1.4:5353
Jun 19 10:12:25 Severity:5 Disconnected.
Jun 19 10:17:00 Severity:5 Connection established xxx.xxx.xxx.xxx -> 151.164.187.11.
Jun 19 10:17:10 Severity:5 Disconnected.
Jun 19 10:17:49 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 10:17:49 Severity:5 Binding added for udp, 0.0.0.0:32770 to 10.0.1.4:5353 with lifetime 7200
Message was edited by: DakotaPaul

This is what the log has looked like for the past several hours.
Jun 19 17:37:49 Severity:5 Binding added for udp, 0.0.0.0:32851 to 10.0.1.4:5353 with lifetime 7200
Jun 19 17:37:50 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:37:51 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:37:53 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:37:57 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:38:05 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:38:21 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:38:53 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:39:04 Severity:5 Binding dropped for udp to 10.0.1.4:5353
Jun 19 17:43:48 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:43:48 Severity:5 Binding added for udp, 0.0.0.0:32852 to 10.0.1.4:5353 with lifetime 7200
Jun 19 17:43:49 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:43:51 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:43:55 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:44:03 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:44:19 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:44:51 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:45:03 Severity:5 Binding dropped for udp to 10.0.1.4:5353
Jun 19 17:49:49 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:49:49 Severity:5 Binding added for udp, 0.0.0.0:32853 to 10.0.1.4:5353 with lifetime 7200
Jun 19 17:49:50 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:49:51 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:49:53 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:49:57 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:50:05 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:50:21 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:50:53 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:51:04 Severity:5 Binding dropped for udp to 10.0.1.4:5353
Jun 19 17:54:46 Severity:5 Rotated CCMP group key.
Jun 19 17:57:01 Severity:7 Network down reported to 10.0.1.4:5353
Jun 19 17:57:01 Severity:5 Binding added for udp, 0.0.0.0:32854 to 10.0.1.4:5353 with lifetime 7200
Thanks for any help you can provide. I'm about to throw the modem and/or router out the window!

Can't set up Aiport Extreme - base station doesn't have valid IP address?

I recently bought an AirPort Extreme to replace my old Linksys wireless router. I am have a cable modem/router supplied by my cable provider and I was using the ethernet cable to connect the modem to the Airport. However, every time I attempt to configure it I get the following message: "Your Apple Wi-Fi base station does not have a valid IP address." I tried to call Comcast to see if there is something I need to get from them, but they want to charge me ~ $45 to enroll me in wireless tech support! Anyways, I'm at my wits' end - please help if you can!

Hello MrRuminator. Welcome to the Apple Discussions!
Each time I attempt to connect to the internet with the AirPort Extreme I run into "Base Station does not have valid IP address -- make sure your base station is connected to your broadband modem..." error. What's odd about this is the fact if I simply plug the ethernet cable back in the older Airport (like right now), I'm able to access the internet once again. Have tried powering off and resetting everything, to no avail.
It still sounds like your modem is not "recognizing" the new 802.11n AirPort Extreme Base Station (AEBSn).
Try the following, in order, until (hopefully) resolved:
1. If the modem has a reset switch, use it to reset the modem. Wait at least 5-10 minutes for the modem to initialize.
2. Remove power from the modem. If it has a backup battery, remove this as well. Wait 5-10 minutes. Replace the battery, and add power back to the modem.
3. Perform a complete power recycle of your network components as follows:
Modem/Router Power Recycling - Quick
o Power-off the modem, AEBSn, & computer(s); Wait at least 5 minutes.
o Power-on the modem; Wait at least 5 minutes.
o Power-on the AEBSn; Wait at least 5 minutes.
o Power-on the computer(s)
If this fails to get the modem to "recognize" the Internet router, then try the "Full" version.
Modem/Router Power ReCycling - Full
o Power-off the modem, AEBSn, & computer(s). (Wait at least 30 minutes. If possible, leave the modem off overnight.)
o Power-on the modem; Wait at least 15 minutes.
o Power-on the AEBSn; Wait at least 5 minutes.
o Power-on the computer(s)
4. Contact your ISP to have them perform a "modem reset."

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