i changed some old Cisco controller AP with AP303 and now some hardware that were ok are disconnecting (they are connected using "telnet"). These are some Windows CE Motorola MT2090 using 802.11G.
version 8.12.0.0-8.12.0
virtual-controller-country FR
virtual-controller-key blabla
name Cluster
virtual-controller-ip 192.168.x.y
terminal-access
ntp-server 194.2.0.28
clock timezone Paris 01 00
clock summer-time CEST recurring last sunday march 02:00 last sunday october 03:00
rf-band all
allow-new-aps
allowed-ap mac
allowed-ap mac
allowed-ap mac
allowed-ap mac
allowed-ap mac
allowed-ap mac
arm
wide-bands none
min-tx-power 9
max-tx-power 127
band-steering-mode prefer-higher-band
air-time-fairness-mode default-access
channel-quality-aware-arm-disable
client-aware
free-channel-index 40
scanning
client-match
rf dot11g-radio-profile
max-distance 0
max-tx-power 9
min-tx-power 6
disable-arm-wids-functions off
free-channel-index 40
rf dot11a-radio-profile
max-distance 0
max-tx-power 18
min-tx-power 12
disable-arm-wids-functions off
mbssid-group-profile _MBSSID1_
syslog-level warn ap-debug
syslog-level warn network
syslog-level warn security
syslog-level warn system
syslog-level warn user
syslog-level warn user-debug
syslog-level warn wireless
extended-ssid
web-server
ssl-protocol tlsv1_2
hash-mgmt-password
hash-mgmt-user admin password hash blabla
wlan access-rule default_wired_port_profile
index 0
rule any any match any any any permit
wlan access-rule wired-SetMeUp
index 2
rule masterip 0.0.0.0 match tcp 80 80 permit
rule masterip 0.0.0.0 match tcp 4343 4343 permit
rule any any match udp 67 68 permit
rule any any match udp 53 53 permit
wlan access-rule SERI_data
index 3
rule any any match any any any permit
wlan access-rule SERI_data-5G
index 4
rule any any match any any any permit
inbound-firewall
rule any any any any match 17 67 68 permit
rule any any any any match 17 546 546 permit
rule any any any any match 1 any any permit
rule any any any any match 58 any any permit
rule any any apip 0.0.0.0 match 6 22 22 permit
rule any any any any match any any any permit
rule any any any any match any any any deny
wlan ssid-profile SERI_data
enable
index 1
type employee
essid SERI_data
wpa-passphrase blabla
opmode wpa-psk-tkip,wpa2-psk-aes
max-authentication-failures 0
rf-band 2.4
captive-portal disable
dtim-period 1
broadcast-filter arp
dmo-channel-utilization-threshold 90
local-probe-req-thresh 0
max-clients-threshold 64
max-retries 3
temporal-diversity
high-throughput-disable
very-high-throughput-disable
high-efficiency-disable
wlan ssid-profile SERI_data-5G
enable
index 2
type employee
essid SERI_data-5G
wpa-passphrase blabla
opmode wpa2-psk-aes
max-authentication-failures 0
rf-band 5.0
captive-portal disable
dtim-period 1
broadcast-filter arp
dmo-channel-utilization-threshold 90
local-probe-req-thresh 0
max-clients-threshold 64
auth-survivability cache-time-out 24
wlan external-captive-portal
server localhost
port 80
url "/"
auth-text "Authenticated"
auto-whitelist-disable
https
blacklist-time 3600
auth-failure-blacklist-time 3600
ids
wireless-containment none
wired-port-profile wired-SetMeUp
switchport-mode access
allowed-vlan all
native-vlan guest
no shutdown
access-rule-name wired-SetMeUp
speed auto
duplex auto
no poe
type guest
captive-portal disable
no dot1x
wired-port-profile default_wired_port_profile
switchport-mode trunk
allowed-vlan all
native-vlan 1
shutdown
access-rule-name default_wired_port_profile
speed auto
duplex full
no poe
type employee
captive-portal disable
no dot1x
enet0-port-profile default_wired_port_profile
uplink
preemption
enforce none
failover-internet-pkt-lost-cnt 10
failover-internet-pkt-send-freq 30
failover-vpn-timeout 180
airgroup
disable
airgroupservice airplay
disable
airgroupservice airprint
disable