The+trust+relationship+between+this+workstation+and+the+primary+domain+failed

=Problem= User tries to login using a domain account and gets the following message: "**The trust relationship between this workstation and the primary domain failed" **

= = =Solution= = =
 * Try unplugging the ethernet cable and logging in with DC account, this will force the use of cache credentials over an established DC connection
 * Log in with local admin account and try removing/re-adding the computer to the domain