Azure VM will not start: AllocationFailed and OverconstrainedAllocationRequest
What the allocation errors mean, how to check VM size restrictions, and the order of fixes that gets a stuck virtual machine running.
Topic: Troubleshooting
The trust relationship between this workstation and the primary domain failed
Why a domain-joined machine loses its secure channel, and how to repair it with PowerShell without leaving and rejoining the domain.
Group Policy is linked but not applying: how to find out why
A step-by-step check using gpresult and the event log, with the security filtering change (MS16-072) that catches many engineers out.
Azure Storage 403 error: AuthorizationFailure or AuthorizationPermissionMismatch
The two 403 errors look alike but have different causes: the storage firewall, or a missing data role. How to tell them apart and fix each.
VMware: "Virtual machine disks consolidation is needed"
How to find affected VMs with PowerCLI, check for locks and backup proxy disks, and consolidate safely.
VMware vMotion fails at 14 or 21 percent: check the MTU first
A vMotion that starts and then times out is usually an MTU or network path problem. The vmkping tests that prove it.