Copy between database using pg_dump and SSH

I want to copy a tabel from one server to another using pg_dump and SSH. Here is the script that I run from the source database : pg_dump -h 127.0.0.1 -Fc --dbname=postgresql://postgres:passwd@127.0.0.1:5432/db_reference --table db_reference.education | ssh -C username@10.100.8.43 "psql -h 10.100.8.43 -U postgres -p 5432 x_db_test" There is error: host key verification failed Questions : 1. Is the command correct? 2. How to remove the error? Thanks