sshd GatewayPorts always “no”

Question

As Trouble enabling GatewayPorts for Remote Port Forwarding over SSH is not really solving my problem, I dare to ask:

I run a server on Ubuntu 16.04.5 LTS.

I need to set the option GatewayPorts to yes.

In /etc/ssh/sshd_config I added the line

GatewayPorts yes

but it has no effect.

Neither service ssh reload nor reboot helps.

The output of

sshd -T -C user=me,host=localhost,addr=IP | grep -E "gatewayports"

results always in gatewayports no.

Even sshd -T -C user=he,host=localhost,addr=127.0.0.1 | grep -E "gatewayports" has the same output.

bug or what is my mistake?

Answer 1

Check if there is GatewayPorts no earlier in the file; if so, delete it.

Options that cannot take multiple values are set according to their first occurrence.