Airport Express unable to extend network

Power off all the entire network.....all devices.....modem, AirPorts, computers, printer, iPhones, etc.....in any order that you want

Wait at least a full minute. This is important.

Power up the modem and let it run for a few minutes all by itself

Then, power up the AirPort Express that is connected to the modem and let it run a full minute or more

Keep starting up other devices one at a time about a minute apart.....but do NOT power up either of the AirPort Expresses that are extending the network yet. Leave them powered off for now.

Check to see that everything can connect to the "main" AirPort Express and that things are working on the network.

Post back on your progress and we will then tackle the extending AirPort Expresses one at a time.

We need to know what device that you will be using to configure the Expresses that will be extending the network. If it is a Mac, we need to know what operating system is installed on the Mac at this time.

If everything on the network looks OK when you power it back up one device at a time, then you can go ahead and power up one of the "extending" AirPort Express devices to see if the current configuration on the Express will "stick".

If the first remote Express comes back up OK, then you can power up the other extending Express.

If everything appears to be OK, then you are done.

But, if the first remote Express still displays the "extending" error, then you will have to reset the Express and set it up again.

The setup is different depending on whether you have a Mac, a PC, or an iPhone/iPad for the task. That is why we were asking what device that you have been using to try to set up the remote Expresses.

If you have been using a Mac.....and you have an iPhone or iPad handy......it would be a good idea to try the setup using the iPhone or iPad. Sometimes, the iOS devices do a better job than a Mac, and vice versa, so you may need to try the setup of the remote Expresses with different devices to get the Expresses back on the tracks.

Nice work, glad that you got the network back up and running!

If you have a moment, can you let us know which of the suggestions that we offered "worked"?

This is called a network power cycle. It will fix about half of all problems about half of the time, so it is an excellent initial troubleshooting step to perform.