Problems connecting multiple macs to an Airport Extreme network.

I think this problem is similar to a previous post, but is individual in some ways.
I have 2 Airport Extreme basestations covering a large flat connected by Ethernet extending a single network. I did try to extend the network wirelessly, but this was plagued with problems where the network would work for 10 mins, then drop out as I think the basestations are slightly too far apart.
Connected to the network are a number of machines:
Wirelessly we have 3x iPhones, 1x G4 Cube, 1x iMac (current model), 2x MacBook Pro (previous model) & 1x PC.
Wired via a hub is an Apple TV, PS3, Nintendo Wii, Denon Home Cinema Amp, PS2
For aprox 6 months I have had major problems connecting all the wireless machines at the same time. I have played around with the security as per previous posts with varying degrees of success.
I seem to have the most problems with the iMac. The iMac will not join the network when there is any form of wireless security. Every time I try to set up a password it hangs when trying to join and I finally get the "There was a error joining xxxx network".
After more playing around I managed to get all the machines working by having no security on the network and locking the network down by MAC addresses.
Since last Thursday I now have a new problem. The iMac joins and stays on the network perfectly, but the second my second MacBook Pro is switched on and joins the network, the internet connection on the iMac drops out. In addition, as we use the iMac as a media server, all other machines connected to the iMac for either file sharing or iTunes sharing then get the error "the remote machine is failing to respond. Please check firewall settings if there are any". What is strange is that the iMac remains on the network, full signal, independent IP address and the second the MacBook Pro is switched off, works perfectly again.
I have tried wiping both the iMac & the MacBook Pro and re-installing their operating systems, but this only solves the problem for aprox 24 hours then all of a sudden the issue re-appears.
Can anyone out there help?

Let's double-check the AirPort Express Base Station's (AX) settings ...
Perform a "factory default" reset of the AX
o (ref: http://docs.info.apple.com/article.html?artnum=108044)
Either connect to the AX's wireless network or connect directly, using an Ethernet cable, to the Ethernet port of the AX, and then using the AirPort Utility in "Manual Setup" mode, check the following settings:
AirPort > Base Station
o Base Station Name: <rename or leave default>
o Base Station Password: <enter desired password>
o Verify Password: <re-enter desired password>
o Remember this password in my keychain: (optional)
o Set time automatically: (unchecked)
AirPort > Wireless
o Wireless Mode: Join a wireless network
o Network Name: <existing AEBSn's wireless network>
o Wireless Security: <select the encryption type of the existing wireless network>
o Wireless Password: <enter the existing wireless network password>
o Verify Password: <re-enter the existing wireless network password>
Music
o Enable AirTunes (checked)
o iTunes Speaker Name: <enter desired speaker name>
o iTunes Speaker Password: (optional)
o Verify Password: (optional)
o Click Update to write the new settings to the AX
In iTunes:
iTunes > Preferences... > Advanced > General
o Look for remote speakers connected with AirTunes (checked)

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Hi Shadow99999
Did you ever resolve your issues with disconnection between your Mac Pro and Airport Extreme? I am having a similar issue.
I have had the extreme for about 4 months and I loose access to the internet about once a month. When I try to troubleshoot the Airport Extreme it is usually inaccessible from my Mac Pro which is my wired access point. The Airport Utility times out with a network error number that unfortunately I did not write down. The light is still green but nothing seems to be working. The first time I tried plugging and unplugging ethernet wires and accessing wirelessly through a Macbook but now I just unplug the Airport Extreme and replug (a Microsoft solution with no problem resolution.) Today I had some unusual internet traffic on my DSL modem and I wanted to look at the Airport Extreme but again I was unable to get to the Airport Extreme with the Airport Utility on my MacPro. (Everything up to the latest rev. per software update.)
The lack of access between the Airport Extreme and a wired computer is really frustrating and may drive me back to my trusty five year old Buffalo Airstation. I could at least log in when I suspected there was a problem. Loss of internet access with the Buffalo was down to maybe once every 6 months to year and lock ups to wired access even rarer.
Any other thread that you found to help you resolve your problem?
Message was edited by: Karl Seibert

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The first important thing to consider here is that Apple does not support Time Machine backups to a drive at the USB port on the AirPort Extreme, so that may likely have something to do with your difficulties.
If you want to continue to try this, the drive must be formatted in Mac OS Extended (Journaled) and you almost always have to use a powered USB hub with a drive at the port of the Extreme...even if the hard drive has its own power supply....because the port on the Extreme is under powered.
Most users who try this unsupported method have corruption difficulties sooner or later, but we do hear from some users who seem to be able to make it work.
The bottom line is that there is no support from Apple on this if you have difficulties, so you may want to consider a secondary backup plan for your important data.

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Hi Shawn,
So the steps listed bellow assume some things. They assume that the Airport Extreme Router your configuring is connected directly to the internet connection. And that the Airport Extreme is the only router between your computers and the internet.
That means we're talking about say a DSL modem plugged directly into the Airport Extreme, or a cable modem. in ether case, this assumes that said modem, is not acting as an internet router.
If your modem has multiple ethernet ports on it, or has a little antenna sticking out of it, then your modem is probable also a router, and these steps listed bellow will probable not work.
Also these steps are so one person, can connect to one computer at your work.
Open Airport Utility:
go to the dock
Click on the finder
go to the menu bar
Click on the "Go" menu
Chose "Utilities" from the "Go" Menu
double Click on "AirPort Utility"
Access the Base Station:
Double Click on your Airport Extreme BaseStation that is your internet connection router.
a new window should pop up with your Airport Base Station as the Window Name
Configure Static Address for the computer you want to connect to via ARD:
Click on the internet Icon from the toolbar
Click on the "DHCP" tab
For "DHCP Reservations:" Click on the "+" button
For the "Description" put "ARD"
For "Reserve Address by:" set "DHCP Client ID"
Click the "Continue" button
For "DHCP Client ID:" set "ARD"
write down the number in "IPv4" address field
Click the "Done" Button
Configure routing to ARD computer:
Click on the "Advanced" icon from the tool bar.
Click on the "Port Mapping" tab
Click on the "+" button
for "Service:" Chose "Apple Remote Desktop"
for "Private IP Address:" copy the exact IP address you wrote down in step "3. 8)"
Click the "Continue" button
Click the "Done" button
Click the "+" button
For the pulldown menu "Service:" Chose "Remote Apple Events"
for "Private IP Address:" copy the exact IP address you wrote down in step "3. 8."
Click the "Continue" button
Click the "Done" button
Click the "+" button
For the pulldown menu "Service:" Chose "Remote Login - SSH"
for "Private IP Address:" copy the exact IP address you wrote down in step "3. 8."
Click the "Continue" button
Click the "Done" button
Click the "Update" button.
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Configure the ARD computer to use the correct IP address:
Go to the computer you want to be able to remotely connect to
On that computer, Go to the menu bar
Chose the "Apple" menu bar
Chose "System Preferences…"
Click on the "Show All" button
Click on the "Network" icon
For the active network connection, (the connection on the left side with the green dot), click on it
Clock on the "Advanced…" button
Click on the "TCP/IP" tab
for the "DHCP Cient ID: field put "ARD".
Click the "OK" button
Click the "Apply" buttonNOTE: Under "Status" you should see "(connection name) is connected to (airport base station name) and has the IP address (IP address)." the "(IP address)" address displayed should match the IP address you wrote down in step "3. 8."
Find out what your public internet IP address is.
On the computer you wish to connect to over the internet, goto http://whatismyipaddress.com/
when the web page loads, you should see "IP Information:" fallow by a number like 192.168.0.1, write down what ever number it is.
At this point you should be able to connect to the computer remotely
connect to the internet from another location.
open Apple Remote Desktop
go to the file menu
chose connect to computer using ip address
set the address to the address to the IP address you wrote down for step 6. 2.
use the same password as you used to connect to the computer at work using ARD.
So here the catch. If your router gets reset... well then your going to have to configure it again. Also all the same rules you have to connect to the computer at work, also apply to connecting to the computer from over the local network. That means your computer need to be on or sleeping. And if it's sleeping it need to be configure to wake for network access.
Also some network connections change. When it comes to internet connections, some connections are static IP, while other connections are DHCP. If your connection is static... great! if it's DHCP, your address may change. If it dose.. well then your ability to connect will break. And then you'd have to do step 6 & 7 again.
Of corse there are ways around this. But that's kind of another conversation.
Some internet locations may block your ability to connect to your computer at work. This is very common at schools, and companies. Basically any place that tries to control your ability to browse the internet, may block remote access to computers; because a remote computer would completely by pass their web filter.
ALSO there is an easier option. As far as setup. There are programs designed to make remotely accessing your mac as easy as possible. For instance there is LogMeIn or Slack. With both of these programs, it's simple. make sure your computer is always on. Then install the software. Create an account with the service. And then you can connect to the computer almost any where by going to their website.
This option requires no router configuration. It handles DHCP. It's designed to work in as many locations as possible.

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Problems connecting multiple macs to an Airport Extreme network.

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