How to fix replication mysql "unable to connect to master"?

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SQL

Linux

replication

I make replication master - slave in mysql database.
IP master (linux on raspberry PI) is 192.168.1.10
IP slave (windows) is 192.168.1.3
But slave (windows) error "Unable to connect to master"
If I switch master become slave and slave become master, error "IO thread not start"
If I config with master (windows) and slave (windows), It success.
How can I fix it?
p/s:
I can ping from windows to linux, and linux to windows.
Please help me. Thanks.