@Peter_O 

Hi,

Does the connection problem occur only in Client Mode or also in Range Extender Mode and Hotspot Mode (WISP Mode)?

What about the 2.4 GHz Wi-Fi? Can the TL-WR902AC connect to the 2.4 GHz Wi-Fi of the Fritzbox 7590 in Client Mode?

  @woozle 

Hi woozle,

thx for your reply. Sorry to answer late.

Your questions set me on the track.

Fiddled with WISP, switched between different WPA modes and finally got WISP to work by changing WPA-Mode on 902.

Back to Client Mode that one works too.

My best guesses what caused the problem:

a) Mismatch between WPA-modes of Fritzbox and 902. (Now WPA2+WPA3 and WPA2-PSK)

b) I had the 902 configured with a fixed IP inside the Fritzbox network, which I do for all devices with kind of central roles. It's now in Smart IP(DHCP) mode (and I configured the Fritzbox to grant the same IP every time). I've not tested with static IP again - never change a running system.

c) kind of crowded WLAN channels during the last test

Consider this thread as solved.

Thx again

Regards

Peter