Error reconnecting to master while show status for DB replication master to master (no replies)

Hello everyone,

I face an issue with data replication.
I am not sure if it effect to data sync from DC to DR.
The message error show in DR side as below when I show slave status:

mysql> show slave status\G;
==============================
Last_IO_Errno: 2003
Last_IO_Error: error reconnecting to master 'xxx' - retry-time: 60 retries: 86400
==============================
OS: Windows Server 2012.
Mysql Version: 5.1.30


Please help.
Thanks in advance.