Bridge P300 can't connect root to non-root bridge

[jens_westermann]

Hi,

our brandnew P300 bridges just arrived. Unfortunately I can't get a connection from root to the non-root bridge. SSID and passphrase are equal, each bridge was configured via laptop before connecting them to our network. What is odd: I made a factory default on both devices and the values should be the same after a factory default IMHO. They aren't, SSID and passphrase is different on both devices, also the RTS/CTS Threshold is at "1024" on one device, "1048575" on the other one.
As the devices are in my office, I set the transmit power to "Minimum" and the distance to the lowest value "1 km".

In the log of the non-root bridge I find entries like "wiredm_pick_wired_vs_wireless: Disqualified proposed_uplink b/c gw_detected=1".

Also tried to configure root bridge as non-root bridge and vice versa. Doesn't work either.

Firmware is the latest 100.1.0.9.43, tried to "upgrade" with the same version again with no effect.

Tested with a pair of ZF7731 successfully before.

Any ideas?

Regards,
Jens