IIS/MSSQL may have a different configuration on his computer than required for Board3 configuration. Also, MSSQL may not be compatible with Board3 at all, requiring a different, supported software package. Does Board3 have a port for MSSQL, or does it use the common XAMP (not the software by Apache ...

MSSQL may not be able to read Board3's tables. Try a WAMP/LAMP software package with your portal and bulletin board.

Try using MySQL database with Apache webserver instead.