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I am upgrading a legacy Drupal 6.37 site running on mysql 5.1 to a fresh install of Drupal 8.2.1 with mysql 5.7.16 on a remote host. I have installed the migration modules required for drush and am able to execute the following:

drush migrate-upgrade
--legacy-db-url=mysql://root:XXXXXXXXXX@172.172.172.172/drupal_db
--legacy-root=http://www.currentsite.com --configure-only

but I am getting this error:

SQLSTATE[42000]: Syntax error or access violation: 1115 Unknown character set: 'utf8mb4'

I am aware of the '_dsn_utf8_fallback' => TRUE, connection setting and have included that parameter in my connection section of settings.php on the new host, but I am still getting the same error.

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