Error while replicating to a remote cluster

I’m trying to set up XDCR and start replication of bucket to a remote but I am getting this error.

2023-04-17 12:58:47 to start service CheckpointManager for 41615554c90015848a79275aad00c02e/NICE/NICE. err=EOF

what does err=EOF defines?

My guess is it’s something network related at this point.