If decoding suddenly stops working make sure the needed eapol packetes are still in it. This also allows you to decode files without any eapol packets in it, as long as Wireshark did see the eapol packets for this communication in another capture after the last start and key edit. So you may try that when decoding fails for unknown reasons. Wireshark only frees used associations when editing keys or when it's closed. with 'wlan.addr') and saving into a new file should get decryption working in all cases. Filtering out only the relevant packets (e.g. Nevertheless, decoding can still fail if there are too many associations. Newer Wireshark versions are able to handle up to 256 associations and should be able to decode any packets all the time. Now if you analyze this you would see 4-way handshake ( EAPOL-Messages 1 to 4 ) messages exchanged after Open Authentication phase finished ( Auth Request, Auth Response, Association Request, Association Response ). Therefore, when several devices have attached to the network while the trace was running, the packet overview shows all packets decoded, but in the detailed packet view, only packets of the last device that activated ciphering are properly deciphered. Here is my packet capture (WPA2-PSK-Final) You can open this in wireshark to test this out by yourself. Older versions of Wireshark may only be able to use the most recently calculated session key to decrypt all packets. WPA and WPA2 use individual keys for each device.
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