Some devices not finding the IP address of my local network

[lrnzmr]

Hey!

Since a week I've thrown out our old router as base station and replaced it with a Time Caspule and a supplementary AirPort Express.
Since then, I've been using the network to browse the internet with devices like my iPhone and MacBook. My family does the same with their MacBooks, iPhones and iPads... But when a new device tries to connect, the Wi-Fi network fails... It doesn't matter if it's an Apple device or not (tried iPhone, Neato, Brother Printer, Garmin watch).
Typically a connecting device would notify it can't get the IP address... Any idea where it might go wrong?

Thank you so much!

Lorenz

 

[techwarrior]

Often, when a new router is discovered, devices need their network stack restarted to clear caches. Try power cycling any devices not making the connection.

 

[l0renz]

Often, when a new router is discovered, devices need their network stack restarted to clear caches. Try power cycling any devices not making the connection.

Unfortunately, the response from all devices remains the same...

 

[BrianBaughn]

If a customer of mine was having such an issue I would have to check all settings on the routers and any provider supplied equipment.