I want to establish logging using NT Security. The problem is that user names in NT have underscore(_). When I establish NT Scurity in SQL security manager, SQL Server tries to add blank names as login id and they will not go through. Is it manadatory to remove underscore from username?

Because of structrual hierarchy, I have different groups in NT to be mapped to SQL Server groups and each group has different permission on SQL tables. In some cases we might have same users in more than one group. I read that it is not possible if you use NT integrated security. Is there any thing that can be worked around this and is this problem still exists in SQL 7.

Thank you in advance
Ali Malekshahi