Dot1x / MAC-Based Authentication issues on a EX2200 with 100BaseEthernet Devices

Hi everybody,

I have some issues with 100BaseEthernet devices on a EX2200 with activated MAC-Based Security on specific Ports.

When I connect a device with a 100Mbit Ethernet on a dot1x-Port the device MAC does not get authenticated. The authenticator on the switch stays on "Connecting":

Interface     Role            State
ge-0/0/34.0   Authenticator   Connecting

The Switch has the latest Firmware (JTAC recommended) installed: 15.1R5.5

I can reproduce this behavior with some other 100Mbit devices. 1Gbit devices get authenticated without any issues.

Thank you in advance.

P.S.: Sorry for my writing but English is not my first language.