MySQL Group Replication fails to understand "::ffff:" IP Address I'm trying to set up group replication using 3 x MySQL 8.0.16 databases, but when I start up the second Node it fails. The error log reports:

[GCS] Connection attempt from IP address ::ffff:10.12.1.2 refused. Address is not in the IP whitelist.


But if I add a whitelist:

group_replication_ip_whitelist="::ffff:10.12.1.2";


I get:

[GCS] Invalid IP or subnet mask in the whitelist: "::ffff:10.12.1.2";


Is this an issue with the server at my end, or an issue with Group Replication not understanding the IP Address?

My configuration is:

server_id=&lt;different for each one&gt;
gtid_mode=ON
enforce_gtid_consistency=ON
binlog_checksum=NONE
transaction_write_set_extraction=XXHASH64
group_replication_group_name="8112d18e-9e6e-11e9-a526-0e51be33883f"
group_replication_start_on_boot=off
group_replication_local_address= "10.12.1.1:33061" /*This is different for each one*/
group_replication_group_seeds= "10.12.1.1:33061,10.12.1.2:33061,10.12.1.3:33061"
group_replication_bootstrap_group=off


If I look on the first nodes error log I can see:

Connection attempt from IP address ::ffff:10.12.1.2 refused. Address is not in the IP whitelist.'


But again, adding it to a whitelist throws the above error about there being an invalid IP Address,
That output is done in the most generic possible way, using IPv4-mapped IPv6 address.

It should work if you simply add:

group_replication_ip_whitelist="10.12.1.2";