As per the instructions at http://progrium.com/localtunnel/ and elsewhere:
gem install localtunnel
localtunnel -k ~/.ssh/id_rsa.pub 3000
I get the error:
/path/to/gems/net-ssh-2.6.7/lib/net/ssh/transport/packet_stream.rb:103:in `block in next_packet': connection closed by remote host (Net::SSH::Disconnect)
It does not matter whether I include the key or not, or try different port numbers i.e.
localtunnel 3000
Any ideas?