Win11 Professional taskbar disappears

Question

Note:

1.The user logging in to the computer is a domain environment.

2.Win10 users within the company will not be affected by the taskbar regardless of whether the policy is turned on or off.

3.Policies implemented on gateway devices. Function: Mainly to restrict access to websites.

Computers that have not joined the domain environment may also experience the disappearance of the taskbar when connected to the company's network.

The taskbar disappears with Windows Explorer not appearing in the process list.

Win+x can call up the taskbar, but the win key cannot call up the menu.

At present, after preliminary investigation, if the policy is enabled, Win11 users in the company's local area network will see the taskbar disappear. If the policy is turned off, it will not occur; Disable the network card connecting to the company's local area network, and it will not happen afterwards.

So it was preliminarily determined that it was a network problem. I don't quite understand. The network should not affect the system settings. @.@