Lightning - Failed to Successfully Connect to Remote Peer

I hope everyone is having a great day so far.

I am trying to open a lightning channel as a part of a liquidity swap using Thunder Hub, but consistently receiving an error message that reads “Failed to Successfully Connect to Remote Peer.”

When I try to connect through the umbrel lightning interface, I get the following error:

“Unable to connect to peer, socks connect tcp 10.21.21.11:9050->71.236.184.238:9735: unknown error connection refused”

Any suggestions as to how I might be able to fix and make the connection successfully?

Thanks in advance,

PB