I have noticed a problem with the iwn firmware.

On the client side I have these settings:
wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether f0:de:f1:c9:14:4d
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet MCS mode 11na
        status: associated
        ssid web channel 56 (5280 MHz 11a ht/40-) bssid 04:f0:21:01:3d:87
        country US authmode WPA2/802.11i privacy ON deftxkey UNDEF
        AES-CCM 3:128-bit txpower 14 bmiss 10 mcastrate 6 mgmtrate 6
        scanvalid 60 bgscan bgscanintvl 300 bgscanidle 250 roam:rssi 7
        roam:rate 64 ampdulimit 64k ampdudensity 8 -amsdutx amsdurx shortgi
        wme roaming MANUAL

wpa_conf:
---
        ctrl_interface=/var/run/wpa_supplicant
        eapol_version=1
        ap_scan=1
        fast_reauth=1

network={
       ssid="web"
       key_mgmt=WPA-PSK
       psk=""
       priority=1
---

It first associates but then  after some traffic the card turns off with thse 
messages:
iwn0: iwn_intr: fatal firmware error
firmware error log:
  error type      = "UNKNOWN" (0x00002078)
  program counter = 0x00009758
  source line     = 0x0000063D
  error data      = 0x400080300000E90F
  branch link     = 0x000096CE000096CE
  interrupt link  = 0x0000D6BE00000000
  time            = 2154208510
driver status:
  tx ring  0: qid=0  cur=66  queued=0
  tx ring  1: qid=1  cur=0   queued=0
  tx ring  2: qid=2  cur=0   queued=0
  tx ring  3: qid=3  cur=8   queued=0
  tx ring  4: qid=4  cur=161 queued=0
  tx ring  5: qid=5  cur=0   queued=0
  tx ring  6: qid=6  cur=0   queued=0
  tx ring  7: qid=7  cur=0   queued=0
  tx ring  8: qid=8  cur=0   queued=0
  tx ring  9: qid=9  cur=0   queued=0
  tx ring 10: qid=10 cur=65  queued=0
  tx ring 11: qid=11 cur=0   queued=0
  tx ring 12: qid=12 cur=0   queued=0
  tx ring 13: qid=13 cur=0   queued=0
  tx ring 14: qid=14 cur=0   queued=0
  tx ring 15: qid=15 cur=0   queued=0
  tx ring 16: qid=16 cur=0   queued=0
  tx ring 17: qid=17 cur=0   queued=0
  tx ring 18: qid=18 cur=0   queued=0
  tx ring 19: qid=19 cur=0   queued=0
  rx ring: cur=50

On the accesspoint I have:
wlan0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric
0 mtu 1500
        ether 04:f0:21:01:3d:87
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: IEEE 802.11 Wireless Ethernet autoselect mode 11na <hostap>
        status: running
        ssid web channel 56 (5280 MHz 11a ht/40-) bssid 04:f0:21:01:3d:87
        regdomain ETSI country SE ecm authmode WPA2/802.11i privacy MIXED
        deftxkey 3 AES-CCM 2:128-bit AES-CCM 3:128-bit txpower 24
mcastrate 6
        mgmtrate 6 scanvalid 60 -ht ampdulimit 64k ampdudensity 8
shortgi wme
        burst dtimperiod 1 -dfs

hostapd.conf:
---
interface=wlan0
driver=bsd
debug=0
logger_syslog=1
logger_syslog_level=0
ctrl_interface=/var/run/hostapd
ctrl_interface_group=wheel
ssid=web
wpa=2
wpa_passphrase=
wpa_key_mgmt=WPA-PSK
wpa_pairwise=CCMP TKIP
rsn_pairwise=CCMP
---


Attachment: smime.p7s
Description: S/MIME Cryptographic Signature

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