This article applies to NoMachine Cloud Server v. 4 and v. 5.

By default, the Cloud Server is configured to connect to the server installed on the same host (localhost).

When the Cloud Server is configured to redirect users' connections to other NoMachine servers, and the NX protocol is used, it's necessary to manually update the list of allowed hosts in the client.crt default certificate for this Cloud Server.

The procedure is the same as for when the Cloud Server is configured to give access to different servers than localhost via the cloud.cfg file. Please see this article, "STEP 2 Update the list of allowed hosts when ConnectionMethod is set to 'NX' in the cloud.cfg configuration file":

https://www.nomachine.com/AR07K00679

for step-by-step instructions.