Issue
Unable to join domain to Active Directory server with these error
GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database) ...
! Couldn't authenticate to active directory: SASL(-1): generic failure: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (Server not found in Kerberos database)
adcli: couldn't connect to [redacted] domain: Couldn't authenticate to active directory: SASL(-1): generic failure:
! Insufficient permissions to join the domain realm: Couldn't join realm: Insufficient permissions to join the domain ...
Caused
Some UDP port is blocked by firewall
53/udp open
123/udp open|filtered
88/udp open|filtered
389/udp open|filtered
464/udp open|filtered
137/udp open|filtered
138/udp open|filtered
636/udp open|filtered
Resolution
Open firewall to UDP port on AD server
53/udp open
123/udp open
88/udp open|filtered
389/udp open
464/udp open|filtered
137/udp open|filtered
138/udp open|filtered
636/udp closed
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