Getting fatal:accept failed: Operation not supported on socket

[Kim Halavakoski]

Hello, trying tmate on my Macbook but getting the following error when trying with -F flag:

[20:16:24] kim:~ $ tmate -a .ssh/authorized_keys -F
To connect to the session locally, run: tmate -S /private/tmp/tmate-501/DkXnPO attach
Using .ssh/authorized_keys for access control
fatal: accept failed: Operation not supported on socket
[20:16:39] kim:~ $ 

Any ideas what wrong with the socket?