Many organizations use LDAP or Active Directory authentication for most of their software connections. Relational database management systems (RDBMS) are no exception.
Some of these organizations use the "firstname.lastname" format for logins.
Unfortunately, the documentation indicates that this format is not supported by ArcGIS with PostgreSQL or Oracle, unlike SQL Server. (And in the real world it sometimes works with limitations or bugs).
This limitation:
- prevents many organizations using PostgreSQL from using LDAP or Active Directory authentication for their geodatabases. (which may be a security good practice)
- may prevent other organizations from using ArcGIS products if their IT department requires AD/LDAP authentication.
This feature exists for SQL Server; it would be beneficial to extend it to other DBMSs.
