check-mysql-connections.rb getting connection error message

[vedantsingh1995]

Check failed to run: Connection refused - connect(2) for "10.236.220.135" port 3306, ["/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/ruby-mysql-2.9.14/lib/mysql/protocol.rb:153:in initialize'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/ruby-mysql-2.9.14/lib/mysql/protocol.rb:153:in new'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/ruby-mysql-2.9.14/lib/mysql/protocol.rb:153:in block in initialize'", "/opt/sensu/embedded/lib/ruby/2.4.0/timeout.rb:76:in timeout'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/ruby-mysql-2.9.14/lib/mysql/protocol.rb:147:in initialize'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/ruby-mysql-2.9.14/lib/mysql.rb:115:in new'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/ruby-mysql-2.9.14/lib/mysql.rb:115:in connect'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/ruby-mysql-2.9.14/lib/mysql.rb:50:in new'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/sensu-plugins-mysql-3.1.0/bin/check-mysql-connections.rb:84:in run'", "/opt/sensu/embedded/lib/ruby/gems/2.4.0/gems/sensu-plugin-1.4.5/lib/sensu-plugin/cli.rb:58:in block in class:CLI'"]

[gonja-dude]

there might be a firewall preventing the sensu server from making the connection. If you have a firewall in place, kindly all inbound traffic from the sensu server to the DB and I am pretty sure that should resolve the connection error message