freget opened a new issue #15963:
URL: https://github.com/apache/airflow/issues/15963
**Apache Airflow version**: 2.0.2 (but problem can still be found in master)
**What happened**:
When using the SSHHook to connect to an ssh server on a non default port,
the host_key setting is not added with the correct hostname to the list of
known hosts. In more detail:
```python
from airflow.providers.ssh.hooks.ssh import SSHHook
import paramiko
from base64 import decodebytes
hook = SSHHook(remote_host="1.2.3.4", port=1234, username="user")
# Usually, host_key would come from the connection_extras, for the sake of
this example we set the value manually:
host_key = "abc" # Some public key
hook.host_key = paramiko.RSAKey(data=decodebytes(host_key.encode("utf-8")))
hook.no_host_key_check = False
conn = hook.get_conn()
```
This yields the exception
paramiko.ssh_exception.SSHException: Server '[1.2.3.4]:1234' not found
in known_hosts
**Reason**:
In the SSHHook the host_key is added using only the name of the remote host.
https://github.com/apache/airflow/blob/5bd6ea784340e0daf1554e207600eae92318ab09/airflow/providers/ssh/hooks/ssh.py#L221
According the the known_hosts format, we would need
```python
hostname = f"[{self.remote_host}]:{self.port}" if self.port != SSH_PORT else
self.remote_host
```
**Anything else we need to know**:
I will prepare a PR that solves the problem.
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