DBeaver 7.1.0 on Windows 10 trying to connect to MySQL 8.0.20 on Ubuntu 20.04 using SSH. I also tried other Windows MySQL GUI clients, with the identical results, which leads me to believe the problem is with MySQL configuration (or maybe with my local Java installation?).
The error message is:
Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
MySQL version information:
# mysql --version
mysql Ver 8.0.20-0ubuntu0.20.04.1 for Linux on x86_64 ((Ubuntu))
# mysqld --version
/usr/sbin/mysqld Ver 8.0.20-0ubuntu0.20.04.1 for Linux on x86_64 ((Ubuntu))
From Windows command line, I can ssh to my server and connect to my database without issue:
FROM WINDOWS COMMAND LINE:
ssh john@erasmus.com
FOLLOWED BY THE FOLLOWING ON THE SERVER:
$ mysql -u admin -p
This is a fresh MySQL install without any config changes. The only thing I did was create a dummy database ("main") and a new database user ("admin") and grant the user access to the database.
CREATE DATABASE main;
CREATE USER 'admin'@'localhost' IDENTIFIED BY 'XXX_PASSWORD_REDACTED_XXX';
GRANT ALL PRIVILEGES ON *.* TO 'admin'@'localhost';
FLUSH PRIVILEGES;
SELECT user,plugin,host FROM mysql.user WHERE user='admin';
+-------+-----------------------+-----------+
| user | plugin | host |
+-------+-----------------------+-----------+
| admin | caching_sha2_password | localhost |
+-------+-----------------------+-----------+
1 row in set (0.00 sec)
In DBeaver, clicking on "Test tunnel configuration" results in success, so SSH tunnel is fine. But clicking on "Test connection" results in an error. See below for the error along with screenshots of my config. Note that I tried using the "MySQL 8+ driver" as well as the "MySQL driver". I also tried using both JSch and SSHJ with the same result. I also tried connecting using 127.0.0.1 instead of localhost, with the same result. I also tried changing the user's plugin from caching_sha2_password to mysql_native_password, with the same result.
MySQL bind-address is the default:
# grep -Irs bind /etc/mysql
mysql.conf.d/mysqld.cnf:bind-address = 127.0.0.1
IPTables is as follows:
# iptables -L -v -n
Chain INPUT (policy DROP 328 packets, 18119 bytes)
pkts bytes target prot opt in out source destination
11517 76M ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
141 32322 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:22
10 492 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
10 576 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:443
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 6069 packets, 647K bytes)
pkts bytes target prot opt in out source destination
Would appreciate any ideas on how to debug further!
Screenshots below:
