Thank you for your kind answers. Up and running again.
@mancha: Unfortunately, your work-around didnīt work. Nothing changed, I think.
(added: PS. Our university runs Cisco wlan routers)
Here, the last lines of the log running 2.4:
EAP-MSCHAPV2: Authentication succeeded
EAP-TLV: TLV Result - Success - EAP-TLV/Phase2 Completed
wlan0: CTRL-EVENT-EAP-SUCCESS EAP authentication completed successfully
nl80211: Unexpected encryption algorithm 5
wlan0: CTRL-EVENT-DISCONNECTED bssid=00:17:df:a7:f7:ec reason=3 locally_generated=1
wlan0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
@mattallmill
Thank you for the nice package. All is well after downgrading.
I also checked upgrading again, and re-downgrading. Old version works, 2.4 does not.
Thanks again. I'll not mark this solved though, because the problem still exists, even if i can do my work now
Thank you all
Franz