Chrome Version: 
Chrome OS Version: Known bad: 9202.54.0 / 57.0.2987.115 & 9331.0.0 / 58.0.3027.0 
Chrome OS Platform: Elm

Steps To Reproduce:
(1) On host, open Chrome Remote Desktop Web App
(2) Under "Remote Assistance", click "Share"
(3) Note the provided Number.
(3) On Elm, open Chrome Remote Desktop Web App
(4) Under "Remote Assistance", click "Access"
(5) Enter the number from (3)
(6) On the Host, click "Share"

Feedback reports:
[1] https://feedback.corp.google.com/product/208/neutron?lView=rd&lReport=54561543646
Chrome remote desktop does not connect keeps saying connecting
9331.0.0 / 58.0.3027.0

[2] https://feedback.corp.google.com/#/Report/55927240665
my chrome remote desktop is not working. I can open it up and see my desktop but I cannot get it to do anything afgter that.Please help me to get this back up and running as it did when I first got my chromebooks
9202.54.0 / 57.0.2987.115

[3] https://feedback.corp.google.com/#/Report/52671165223
... update from 55 to 56 and since then I cannot get my acer chromebook r13 to be able to connect to the chrome remote desktop app.
8872.76.0 / 55.0.2883.105 [presumably feedback was sent after recovering to the working stable M-55 release]

Expected Result:

Host desktop is viewable and controllable from Elm.

Actual Result:

Elm shows: "Unable to reach the host.  This is probably due to the configuration of the network you are using."

Note, however, that the opposite direction *does* work (e.g., a linux host can view/control Elm's shared desktop), even when both devices are connected to the same network.

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)

Always, however, it is reported that this used to work on earlier versions.

What is the impact to the user, and is there a workaround? If so, what is
it?

Cannot use Chrome Remote Desktop to connect to a remote host.

Please provide any additional information below. Attach a screen shot or
log if possible.