Created attachment 1749827 [details]
/varlog/messages snippet for the VNC scenario

Description of problem:

gnome-keyring-daemon fails to lock the keyring in GNOME sessions started from
a remote display, either via VNC or XDMCP 

Version-Release number of selected component (if applicable):

gnome-keyring-pam-3.28.2-1.el8.x86_64
gnome-keyring-3.28.2-1.el8.x86_64
seahorse-3.20.0-9.el8.x86_64 (for tests)

How reproducible:

Always

Steps to Reproduce:
1. Configure remote access via VNC and/or XDMCP, following the instructions in
   at least one of these documents:

   - How do I setup VNC based on xinetd with XDMCP for GDM?
     https://access.redhat.com/solutions/2516

   - How to configure a RHEL to allow remote access to GDM via XDMCP?
     https://access.redhat.com/solutions/2736

   - Are there any changes to the default vncserver configuration in RHEL8.3?
     https://access.redhat.com/solutions/5544351

   Notice that the three access methods can be configured simultaneously on
   the same machine.
   
2. Start the VNC session or log in via GDM

3. Open the "Passwords and Keys" application (seahorse) a "Login" tab should
   appear.

Actual results:

The the "Login" does not appear.

Expected results:

The the "Login" does not appear in searhorse.

Additional info:

Attaching /var/log/messages snippets corresponding to the three scenarios.

The problem can be partially circumvented by adding an autostart file at
/etc/xdg/autostart/gnome-keyring-replace.desktop that replaces the running
daemon but it does not automatically unlock the keyring, since there is no
secure way to provide the user password.