Unable to Remotely Connect to MySQL

Unable to connect to MySQL remotely.
We have two AWS lightsail instances (Ubuntu 14.04.5) and are trying to connect from one to the other.
Both versions of MySQL are 5.6.35.

The last thing I want to do is replication, and the replication slave MySQL log is

Slave I/O: error connecting to master '[email protected]:3306' -
retry-time:60 retries:37, Error_code:2003

appears, but before that, simply

 mysql-h xxx.xxx.xxx.xxx-uhoge

However, you cannot connect with the following error:

ERROR 2003 (HY000): Can't connect to MySQL server on 'xxx.xxx.xxx.xxx'
(110)

Telnet also

telnet xxx.xxx.xxx.xxx 3306

telnet:Unable to connect to remote host:Connection timed out

I can't connect to it, so I think it's around the port, but I don't know the cause or countermeasure.

Here's what I've done.
Verify MySQL user hoge connection authorization settings
(The hoge was created with grant replication slave on*.* to hoge@'%' identified by 'password'; )

mysql>select user, host from mysql.user;
+-------------+------------------+
| user | host |
+-------------+------------------+
| US>repl|%|
| root | 127.0.0.1 |
| root|::1|
| root | ip-xxx-xxx-xxx-xxx-xx |
| rails_admin | localhost |
| root | localhost |
+-------------+------------------+

My.cnf bind-access comment out

#bind-address=127.0.0.1

Verify Firewall

$sudo iptables-L
Chain INPUT (policy ACCEPT)
target protopt source destination

Chain Forward (policy ACCEPT)
target protopt source destination

Chain OUTPUT (policy ACCEPT)
target protopt source destination

$ sudo ip6 tables-nv-L
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target protopt in out source destination 

Chain Forward (policy ACCEPT0 packets, 0 bytes)
 pkts bytes target protopt in out source destination 

Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target protopt in out source destination

Verifying Ports

$sudonetstat-tlpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp00 0.0.0.0:800.0.0.0:*LISTEN29604/
tcp00 127.0.0.1:210.0.0.0:*LISTEN595/vsftpd
tcp00 0.0.0.0:22 0.0.0.0:*LISTEN901/sshd
tcp00 0.0.0.0:443 0.0.0.0:*LISTEN29604/
tcp600:::3306:::*LISTEN29139/mysqld.bin
tcp600:::22:::*LISTEN901/sshd

Thank you for your cooperation.

mysql ubuntu network unix

2022-09-30 14:12

1 Answers

If the server is not LISTENing the port, the client error should be Connection refused. I think Connection timed out is a problem around the network (firewalls, routing, etc.).

Whether or not the server is pinged from the slave.

If the ping goes through, can you connect to a port other than 3306 (such as number 22)?

You might want to check the firewall on the client side as well.

2022-09-30 14:12

If you have any answers or tips

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