如题，放假在家玩树莓派集群，其中一台连不上数据库，今日怪事+1
=============================================================================
状态描述：
平台树莓派 4B，架构 armv7，系统 raspbian 最新( debian10 )
数据库版本 mariadb-server version: 10.3.22
安装 mariadb-server & client 后，
本地 mysql ( client ) 、以及 pypmyadmin可以连接数据库，工作正常。
远程连接( navicat 等)不能连接数据库，提示
>> mysql -h192.168.0.109 -uroot
ERROR 2002 (HY000): Can't connect to MySQL server on '192.168.0.106' (10061)
=============================================================================
配置方面，
/etc/mysql/f 中设置了绑定任意
[mysqld]
bind-address=0.0.0.0
数据库方面,select user,host from mysql.user; 返回
+------+------+
| user | host |
+------+------+
| root | % |
+------+------+
网络方面，ifconfig 显示
wlan0: flags=4163 mtu 1500
inet 192.168.0.106 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::aff7:f451:c78e:c4eb prefixlen 64 scopeid 0x20
ether dc:a6:32:10:7a:44 txqueuelen 1000 (Ethernet)
RX packets 123134 bytes 147417079 (140.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 49386 bytes 8702996 (8.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
远程连接能正确到达指定端口
C:\Windows\System32>tcping 192.168.0.106 3306
Probing 192.168.0.106:3306/tcp - Port is open - time=4.249ms
Probing 192.168.0.106:3306/tcp - Port is open - time=2.502ms
Probing 192.168.0.106:3306/tcp - Port is open - time=3.440ms
Probing 192.168.0.106:3306/tcp - Port is open - time=2.913ms
Ping statistics for 192.168.0.106:3306
4 probes sent.
4 successful, 0 failed. (0.00% fail)
Approximate trip times in milli-seconds:
Minimum = 2.502ms, Maximum = 4.249ms, Average = 3.276ms
感觉十分奇怪，第一次遇到这种情况，感觉配置和网络都没啥问题，不知道为啥连不上，求助。
