Secure Computing SG300 User Manual page 320

Select Set up an advanced connection and click Next.
Select Connect directly to another computer and click Next.
Select Guest and click Next.
In Computer Name, enter an arbitrary name for this connection (e.g. SG null modem)
and click Next.
From the Select device drop down box, select the local PC's serial (COM) port to which
the null modem is attached, click Next.
Click Finish.
The network connection now appears under Network Connections in Control Panel
under the Direct heading. Double-click the connection, enter a dial-in user name and
password if you added one on the SnapGear unit, and click Connect.
Troubleshooting
If you are unable to establish a connection, ensure the serial port settings on the
SnapGear unit match those of the local PC.
On the SnapGear unit, select Network Setup from the Network Setup section of the
main menu, Modify the dial-in connection, and select the Port Settings tab to modify
port settings.
If the local PC is running Windows XP, right-click the connection you added in the
previous section, select Properties, select the General tab and click Configure to
modify port settings.
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Appendix F – Null Modem Administration