I have a master running MySQL 5.6.17 on Windows 10, and a slave running MySQL 5.7.25 on an Ubuntu 17.10 box on a (Windows) LAN.
Replication ran fine until Ubuntu upgrade to 18.04. Now slave repeatedly gives the following error:
"Slave I/O for channel '': error connecting to master 'repl@xxxxxx:3306' - retry-time: 60 retries: 12, Error_code: 2005" (master server name x'd out).
repl user connects fine to the MySQL instance on the master from the mysql client program running on the slave machine terminal. (And vice versa).
Resetting the master then running:
STOP SLAVE; CHANGE MASTER TO master_host='xxxxxx', master_port=3306, master_user='repl', master_password='xxxxxx', master_heartbeat_period=1, MASTER_LOG_FILE='xxxxxx-binlog.000001', MASTER_LOG_POS=120 ; START SLAVE;
... (again identifying names x'd out) yielded no change.
I'm at a loss. Anybody?