Authorization required, but no authorization protocol specified

When changing the hostname in the icewm-session, the application startup breaks down. Such errors are written in the logs .xsession-errors when launching applications:

Authorization required, but no authorization protocol specified
xterm: Xt error: Can't open display: :0

When i start the distribution (native build), xdm starts. After logging in to xdm, the script .xsession is run from the user's home directory, which contains:

#!/bin/bash

icewm-session -s

Next, the icewm session starts. If I log in again, then everything works fine. But as soon as I change the hostname, it becomes impossible to launch applications, although there are no problems in the icewm session. I created a issue for the problem, but it was rejected. Do I need to configure something additionally?