Connection reset by {ssh hostname} port 22 - ssh

Question

I'm trying to set up a raspberry pi with the command ssh pi#raspberrypi.local but I keep getting these messages:
ssh -v pi#raspberrypi.local
OpenSSH_7.4p1, LibreSSL 2.5.0
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 53: Applying options for *
debug1: Connecting to raspberrypi.local [2601:47:4001:d250:88ff:ddb5:f761:74d2] port 22.
debug1: Connection established.
debug1: identity file /Users/liz/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/liz/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/liz/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/liz/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/liz/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/liz/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/liz/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/liz/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Raspbian-10+deb9u1
debug1: match: OpenSSH_7.4p1 Raspbian-10+deb9u1 pat OpenSSH* compat 0x04000000
debug1: Authenticating to raspberrypi.local:22 as 'pi'
debug1: SSH2_MSG_KEXINIT sent
Connection reset by 2601:47:4001:d250:88ff:ddb5:f761:74d2 port 22
I have a hunch that it has something to do with the fact that I previously ssh-ed into a different raspberry pi with the exact same hostname and username, but I don't know how to fix it so that I can access this one (and probably rename it to avoid this problem in the future). I tried doing ssh-keygen -R raspberrypi.local but I'm still getting the same messages.
Is there more I need to do to remove it? I'm also using a mac running on Sierra 10.12.6. I tried looking through similar issues but couldn't find anything that worked.
Thanks!

Answer 1

I had this problem too.
Here's the solution that worked for me:
https://raspberrypi.stackexchange.com/a/60375/26923
In essence:
rm /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server
I believe the problem is that the keypair files that are generated on first boot were corrupt (perhaps from plugging and unplugging power during the setup process).

Answer 2

I ended up installing dpkg via homebrew, and re-flashing the SSD card and then it worked. Not really sure why it was so finicky but helpful information in case anyone else runs into a similar issue.