How do I stop automatic start-up of the SonicWall Connect Tunnel on my Windows PC?

One user login with Domain user, SonicWall CT will pop up automatically each time, this is from startup menu.

User has most probably configured the client to operate in such a way while installing. By Default this will be loaded in Startmenu. 

Note: If we don't want to showup each login we can remove it.

Press Win-r. In the "Open:" field, type:
C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp
Press Enter.

Delete the SonicWall CT shortcut and restart your PC to test.