DSN

Due to limited access rights of ASP.NET user and user group
accounts, data sources created as User DSNs may not be loaded. You
must create the data sources for your Web Forms application as System
DSNs.

Oracle

The appropriate user or user group must be granted full control
rights to the Oracle Client directory. For example, if the Oracle
client is installed in the c:oracleora9 directory,
the ASPNET user (IIS 5), the IIS_WPG user group (IIS 6),
or the IIS_IUSRS user group (IIS 7 and 7.5) must have full
control rights to this directory.

SQL Anywhere

To launch a SQL Anywhere database automatically from a Web
Forms application, the appropriate user or user group must be granted
at least read and execution rights to the directory indicated by
the SQLANY10 or ASANY9 environment variable. The ASPNET user, the
IIS_WPG user group, or the IIS_IUSRS user group
must also have full control privileges to the directory that contains
the database.

Database connections using an INI file

If your application uses an INI file to get database connection
information, make sure to add the INI file to the resource file
list of your .NET Web Forms project before you deploy it.

JDBC connections

If an error message indicates that the Java VM cannot be initialized,
make sure that the system CLASSPATH and JAVA_HOME environment
variables have been set correctly. If an error message indicates that
you are attempting to read from or write to protected memory, make
sure the ASPNET user, the IIS_WPG user group, or the IIS_IUSRS
user group has at least read, execute, and list folder contents
permissions for the vendor’s JDBC directory.

After making any changes to the directory permissions or system
environment variables, restart the IIS service and either ASPNET_WP.EXE
(IIS 5) or W3WP.EXE (IIS 6, IIS 7, and IIS 7.5). Alternatively,
you can restart the IIS server to make sure that the changes take
effect.