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macossshlibressl

ssh_exchange_identification: Connection closed by remote host Mac

I'm trying to ssh to a mac PC from a Ubuntu 16.04 machine. I'm using this command

 ssh username@192.168.17.74 -p 9900

The open port is 9900 but I get this error

ssh_exchange_identification: Connection closed by remote host

But if I try ssh username@localhost form the mac PC then it does not give any error. The firewall is disabled and I have allowed all incoming connections. The OpenSSH version is 7.5p1.

Please note that the mac PC is in a remote geographic location and I'm accessing it via TeamViewer.

Solution

  • Try adding a -v to your ssh command. That's helped me debug connection issues in the past.

    If I had to guess, I'd say that you have the needed credentials on your Mac, but not on the other machine.