Block producing node unable to connect to relay node

My relay node is running and the block is up to date. However my block producing node is unable to connect to my relay node.
On the block producing node I get:
exception: Network.Socket.connect: <socket: 25>: does not exist (Connection refused)

ufw is set up and running on the 2 nodes
Router has relay port open
relay node topology.json has iohk and block producing node listed
block producing node topology.json has relay node listed
relay node and block producing node are able to ping each other

Not sure what else could be needed

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This error means the node is not up:

Please check this thread for a possible solution:

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