A member of the admins group reports being unable to modify the "changes" file on a server. The permissions on the file are as follows: Permissions User Group File -rwxrw-r--+ Admins Admins changes…

While SELinux in enforcing mode could prevent file modification, the provided permission output only indicates the presence of an ACL via the `+` symbol, making it the most direct and specific explanation given the available information.

SELinux in permissive mode would allow the action but log a warning, therefore it would not prevent the user from modifying the file.

The `+` symbol appended to the permission string (`-rwxrw-r--+`) signifies that an Access Control List (ACL) has been applied to the file. ACLs provide a more granular level of permission control than standard Unix permissions and can override or further restrict access for specific users or groups. Therefore, a denying entry within the FACL would prevent the user from modifying the file, even if the base group permissions appear to grant write access.

The permission string `-rwxrw-r--+` explicitly shows `rw-` for the `Admins` group, indicating that the group *does* have write permissions under the standard Unix model.