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I'm trying to use a TP-Link TL-WN722N WiFi adapter with Hostapd. However when I try to start Hostapd I get this messages:

Configuration file: hostapd.conf nl80211: Could not configure driver mode nl80211 driver initialization failed. hostapd_free_hapd_data: Interface wlan0 wasn't started

hostapd.conf

interface=wlan0 driver=nl80211 ssid=test channel=1

I've tried to apt-get update and upgrade but I still get the same error. Running Raspbian.

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2 Answers 2

Reset to default
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Fixed this problem by killing wpa_supplicant:

killall wpa_supplicant
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0

Have you tried bringing wlan0 up manually before starting hostapd? try:

sudo ifup wlan0
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