The authenticity of host '10.64.32.49 (10.64.32.49)' can't be established.

[hkcoserlamyiupong]

I still cannot open jupyter notebook on gpu farm due to 'Token authentication is enabled'. (which happened occasionally from time to time before)
Moreover, when I tried
ssh -L 8888:localhost:8888 sdedward@10.64.32.49
It says
The authenticity of host '10.64.32.49 (10.64.32.49)' can't be established.
ED25519 key fingerprint is SHA256:sR4t9T6WsrReh5svFtvCx/xwBeEYQSzBcGGXhtMOZyg.
This key is not known by any other names
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '10.64.32.49' (ED25519) to the list of known hosts.
sdedward@10.64.32.49's password:
bind [127.0.0.1]:8888: Permission denied
channel_setup_fwd_listener_tcpip: cannot listen to port: 8888
Could not request local forwarding.