Timed out while reading client stream prefix

[metanovii]

Hi! I'm trying to send a request, after which the service connects to an external database and then I get a response mysql gona away.
And log from proxy:

INFO ThreadId(01) outbound:accept{peer.addr=10.244.0.47:47582 target.addr={{ external_mysql_server_ip }}:3315}: linkerd2_app_core::serve: Connection closed error=Timed out while reading client stream prefix

what does it mean?

[grampelberg]

See protocol detection. MySQL is a server-speaks-first protocol, so you'll want to skip that port on the outbound.