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File shares: delegation

Check id files.delegation

What it checks

To open a file share as a person, Gate needs Active Directory's permission to ask for that person's ticket to the file server (constrained delegation with protocol transition), limited to your file servers and domain controllers. Windows edition: the server's computer account. Linux appliance: gate-svc.

What you might see

ProblemComputer account GATE1$ may not act for people who signed in without Kerberos (protocol transition is off)."Use any authentication protocol" is not set.
ProblemGate server GATE1$ may not delegate to: cifs/fs1.corp.example, cifs/fs1.A file server is missing from the allowed list.
OKGATE1$ may open 3 server(s) and DC(s) as people (constrained delegation + protocol transition).Fine.

How to fix it

  1. In Active Directory Users and Computers, open the Gate server's computer account (Linux appliance: the gate-svc user) → Delegation tab.
  2. Choose Trust this computer for delegation to specified services only and Use any authentication protocol.
  3. Add → Users or Computers → each file server and domain controller → select the cifs service.
  4. Security tip from the same check: mark admin accounts Account is sensitive and cannot be delegated (user → Account tab), so no service can ever act as them.

Command line (on a DC, Windows edition)

Set-ADAccountControl -Identity GATE1$ -TrustedToAuthForDelegation $true
Set-ADComputer -Identity GATE1$ -Add @{'msDS-AllowedToDelegateTo'=@('cifs/fs1.corp.example','cifs/fs1')}
Set-ADUser -Identity admin.jane -AccountNotDelegated $true

Command line (on a DC, Linux appliance)

Set-ADAccountControl gate-svc -TrustedToAuthForDelegation $true
Set-ADUser gate-svc -Add @{'msDS-AllowedToDelegateTo'=@('cifs/fs1.corp.example','cifs/fs1')}

Related checks

File shares: service brokerShare (each mapped drive)

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