extender refuses client connection

[ute_zi]

I extablished a connection from the extender WN3000RP to my Fritz!Box 5330 via WPS (2.4 Ghz)

and I can connect to the extender web page via its assigned IP address.

I can not connect any client to the extender using Wi-Fi
When trying to connect any mobile client to the extender it says "Couldn't connect to network"
connecting any mobile client to the Fritz!Box is not a problem.

The extender was working fine for years till about 2 weeks ago
factory reset was done on both, router and extender but did not help

any help would be greatly appreciated!!

Merry Christmas

Extender Status

Hardware Version	WN3000RPv1h2
Firmware Version	V1.0.2.64_1.1.86
GUI Language Version	V1.0.2.64_2.1.9.1
Connection Status to Existing Network
Name (SSID)	BLUB
Link Rate	300 Mbps
Connection Status	Connected

[plemans]

Try setting up the extender using the installation assistant and not WPS. 

[nielsvds]

You should also check the passphrase that is used in the extended network that it is still the same as that of your existing router. When doing the smart installation don't forget to check the box use the same security ...as those of the existing network.

[ute_zi]

thank you nielsvds for your response!

Setting up a connection between the extender and the router is not a problem.

And all settings (security and passphrase) are the same.

and they connect without problems any time, like after an off/on of the extender or the router.

its the mobile client side were the problems are
they have the same settings (security and passphrase) but fail every time connecting to the extender.
connecting the mobile clients directly to the the router using those (same) settings is not a problem.

[ute_zi]

thank you plemans for your reponse!

connecting the extender to the router is not the problem.

using WPS or the assitant, it always connects without problems.

conneting the mobile clients to the router works as well without problem.

it is when I want to connect the mobile client to the extender that I cant connect.

[nielsvds]

I would try a reset of your network settings.

Android phone: https://www.howtogeek.com/710873/how-to-reset-network-settings-on-android/

Iphone: https://support.apple.com/en-us/HT204051 (step 7)
Windows system: https://www.howtogeek.com/265870/how-to-reset-your-entire-network-in-windows-10-and-start-from-scrat...
Are you using fixed IP addresses or dynamic IP addresses (DHCP)?