We are repeatedly getting Error 15401 when adding couple AD logins in upper case(DOMAIN_NM\USR_NM) to a sql 2008 server with the latin1_general, binary sort collation. Lower case (DOMAIN_NM\usr_nm) works fine. All the other servers, even the
ones with the same collation, it is the opposite, upper case works and not the lower case.
Looked for duplicate SIDs in the domain, on the sql server, did not find any. Any idea what's going on?.
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