Appendix: Troubleshooting Problems54
8.3 Problems and Solutions
8.3.1 Network Adapter cannot be selected via Network Manager
Cause: APIPA is disabled
The alternative mechanism for IP addressing (APIPA) is usually enabled on all
Windows XP and Vista systems. Network security policies, however, may
request the APIPA mechanism to be disabled. In this case, you cannot use a
network adapter which is configured for DHCP to access ETAS hardware. The
ETAS Network Manager displays a warning message.
The APIPA mechanism can be enabled by editing the Windows registry. This is
permitted only to users who have administrator privileges. It should be done
only in coordination with your network administrator.
To enable the APIPA mechanism:
• Open the Registry Editor:
– Windows XP:
Click Start and then click Run. Enter
regedit and click OK.
– Windows Vista:
Click Start, enter regedit in the entry
field, and push <E
NTER>.
The registry editor is displayed.
• Open the folder
HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\
Tcpic\Parameters\
•Click Edit → Find to search for the key
IPAutoconfigurationEnabled.
If you cannot find any instances of the registry key mentioned, the APIPA
mechanism has not been disabled on your system, i.e. there is no need to
enable it. Otherwise proceed with the following steps.
• Set the value of the key
IPAutoconfigurationEnabled to 1 to
enable the APIPA mechanism.
You may find several instances of this key in
the Windows registry which either apply to
the TCP/IP service in general or to a specific
Manual.book Seite 54 Montag, 13. Juli 2009 6:24 18
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