Unable to write tag to PLC

Hello,
First time using ignition here. I am trying to create a button that will start my machine. I am able to change the value in the designer and start the machine but unable to change it when inside the client. Whenever I press the button in the client I get the following two messages in the logs(See Below). I have set the tag to read/write. Thank you!

"Failed to create subscription 'tag-group-default_default': io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: getsockopt: /10.79.212.251:4840"

"subscriptionName=tag-group-default_default, ignSubscription=com.inductiveautomation.ignition.gateway.opcua.client.connection.OpcUaSubscriptionModel$IgnitionSubscription@66dce611, opcSubscription=null"

These aren't in response to your button press, but they are an indication that you are unable to connect to the OPC UA server at 10.79.212.251:4840.

Based on the error (connection refused) you have probably never had a successful connection to this server. Or if you did, something changed, and you don't now.

Likely causes could be firewall blocking the attempt, wrong IP/port information, or the server isn't configured/running.

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