Login process should be quick and fast, so every user will be happy and start the day smoothly. But not every day is a new year’s day and there are times that things will just go south and some issues will surface. Enabling verbose login in local group policy will definitely help to troubleshoot which part of the login process the system halts and takes a long time to process. Folder redirection for some reason will cause an issue that will take time to load the desktop or causes a login issue. There are quite a lot of reasons why a GPO takes time to process, and causes login issue. But if a computer or workstation has been working fine and all of a sudden gives a logon issue; no changes has been made on the server or GPO. Then an issue could occur at the workstation or client side. One solution that might work on this kind of scenario is to open an elevated command prompt and issue this command on the problematic user computer: Netsh winsock reset ...
Make the world a better place by sharing knowledge, ideas and anything that you can give that comes from the heart.