Been dealing with this issue at work, can't connect to the Wifi network here.
It works on another of my laptop with the same OS and a different network card, but this Thinkpad T401s with a rtl8191sevb card can't stay connected.
The wifi will connect, ping or any other network service won't work, and after a few seconds it disconnects me. Then it just loops over that endlessly.
Following is the syslog when this happens.
We can see that I'm getting a DHCP lease, but then we start seeing something like "Michael MIC failure detected", and "TKIP countermeasures started" just before "deauthenticating from 02:18:4a:bb:32:f0 by local choice (Reason: 14=MIC_FAILURE)"
The network here is using WPA2 with TKIP (not AES)
Things I tried so far:
Uninstall TLP, disable power saving in the BIOS, disabled wifi card power saving.
sudo iwconfig wlan0 power off
sudo killall wpa_supplicant
Adding "options iwlwifi 11n_disable=1" to iwlwifi.conf
Unfortunately this is not my AP so I have to live with TKIP. Any ideas?
Here is the paste from wireless-info: https://pastebin.com/M4VtvDqM
Here are the system logs when this issue is occurring: https://pastebin.com/zL9NrY0q
Quite frustrating that this works on 3 out of my 4 machines. Just this one thinkpad 410s is giving me troubles!