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pt-table-checksum fails to connect to slave

wpirragliawpirraglia EntrantCurrent User Role Beginner
Executing pt-table-checksum on mariadb 10.1.20 with ubuntu xenial 16.04.2 gets the following error:
06-28T14:01:37 DBI connect(';host=xxxxx;mysql_read_default_group=client','xxxxx',...) failed: SSL connection error: unknown error number at /opt/scripts/pt-table-checksum line 1586.

The same parameters and configuration were being used with ubuntu precise 12.04.5, and was working ok.
The mysql user for runing pt-table-checksum has the following permissions on all the server databases, besides having all privileges on the database where the checksum results are kept:
GRANT SELECT, PROCESS, SUPER, REPLICATION SLAVE, REPLICATION CLIENT ON *.*

Will appreciate any answer about it!
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