DDNS ssh gets stuck after “SSH2_MSG_KEXINIT sent” message

I am trying to set up ssh logging from across the internet. I have a DDNS noip.com domain which I can successfully ping and it reaches my host. The DDNS is configured straight on my router and the relevant ports have been forwarded (port 22). When I execute ssh -vv myuser@foo.ddns.net -p 8001 I get the following: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: resolving "foo.ddns.net" port 8001 debug2: ssh_connect_direct: needpriv 0 debug1: Connecting to foo.ddns.net [123.456.789.100] port 8001. debug1: Connection established. debug1: identity file /home/myuser/.ssh/id_rsa type 0 debug1: key_load_public: No such file or directory debug1: identity file /home/myuser/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myuser/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myuser/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myuser/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myuser/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myuser/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/myuser/.ssh/id_ed25519-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to foo.ddns.net:8001 as 'myuser' debug1: SSH2_MSG_KEXINIT sent I've disabled the router firewall, the OS firewall, I've edited hosts.allow and hosts.deny to allow everything. How can I get ssh to authenticate successfully or give me an error message of sorts?