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PgAdmin with SSH tunnel


I'm using Debian Stretch and I'm trying to connect to PostgreSQL server
(Debian 9) with PgAdmin (Debian 9) through SSH tunnel.

PgAdmin has built-in SSH support but when I try to connect to remote
PostgreSQL server I get this error in PgAdmin:

Error: SSH error: Error when starting up SSH session with error code -8
[Unable to exchange encryption keys]

I use key pair for OpenSSH authentication.

Any ideas what is wrong?

Kind regards