Failure phenomena:
Win7 Input account login, the error "the trust relationship between this workstation and the primary domain failed", all domain users cannot log on,
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How to resolve:
1. Microsoft official, fallback domain rejoin domain
https://support.microsoft.com/en-us/kb/2771040
2. Other recommendations, "Reset your computer account"
Https://redmondmag.com/articles/2014/04/21/domain-trust-issues.aspx
Win7 Workstation and Primary domain trust relationship failed