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Need help with 802.11 decryption and monitor mode!

Hi there,

i'm very new in this topic. I have a WLan with WPA2-PSK decryption. My idea was to switch my TP-Link TL-WN722N into monitor mode and sniff the packets. My problem is that I put in the pre-shared-key (created with in the preferences, but it did not decrypt the traffic. Also when I want to change the mode into monitor mode, I have to kill the network-manager, which is bad, because I lose the connection to my WLan. Knows anybody a solution for this? I'm using Kali Linux and Wireshark version 2.6.8. I hope that you guys can help me!

Best wishes!

PS: If i had 60 points, i would upload pictures...