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T
ROUBLESHOOTING
The table below lists symptoms of common problems, possible causes, and possible solutions. For additional troubleshooting
information from the User Guide, FAQs, and other technical notes, refer to:
http://www.remoteaccess.3com.com/support/docs/lanmodem/welcome.html.
Symptom
Possible Cause
Launching your Web
Incompatible IP address on
browser does not start
your computer.
the configuration
process (the welcome
message does not
appear).
Web browser needs the IP
address of the LAN Modem.
Web browser may not be set
to a default start page.
Web browser may be
configured to use a proxy
server.
There is a configuration
problem.
Clicking "submit"
JavaScript may not be
during configuration
enabled in your Web
does not take you to
browser.
the next screen.
At installation, LAN
Wrong cable used to
LED does not light.
connect your computer to
the LAN Modem's LAN port.
At installation, ALERT
An internal failure.
LED remains lit.
At installation, ALERT
Self-test failure, or the LAN
LED continues to flash.
Modem is in firmware
download mode
No dial tone when
The telephone line cable,
handset of a phone
power cable and/or phone
attached to the LAN
cable may not be firmly
Modem is lifted.
connected.
Telephone cable may not be
in the correct port.
A data call may be in
progress.
3Com Corporation, 5400 Bayfront Plaza, Santa Clara, California, 95052-8145
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Solution
Reset the IP address on your computer, as follows:
Windows 98 and 95: Run Winipcfg.exe. Select the Ethernet adapter connected to the 56K LAN
Modem. Click Release All and then Renew All.
Windows NT 4.0: Run ipconfig /release and then ipconfig /renew.
Macintosh: From the Apple menu, select Control Panels and then TCP/IP. Make sure Ethernet is
selected in the Connect via field. In the Configure field, select Using BootP Server to clear the fields,
then close and save changes. Open the TCP/IP control panel again and select Using DHCP Server. The
fields should now read <will be supplied by server>. Select File, then Close, and save
changes when prompted.
Enter the following URL in your Web browser: http://3com.oc.lanmodem. Alternatively, you
can enter http://192.168.1.1.
Launch your Web browser and enter a default URL, as follows:
Internet Explorer: From the View menu, select Options. From Page, select Start Page, and then
enter an address in the address field, such as http://www.3com.com.
Netscape: From the Options menu, select General Preferences. From Browser Starts With, select
Home Page Location, and then enter a URL such as http://www.3com.com.
Launch your Web browser, and then set the browser to use the LAN Modem, as follows:
Internet Explorer: From the View menu, select Internet Options, and then the Connection tab.
Under the Proxy Server header, uncheck the box labeled Accessing the Internet using a proxy server.
Netscape: From the Edit menu, select Preferences. Double-click Advanced, and then click Proxies.
Check the box labeled Direct Connection to the Internet.
Reset the 56K LAN Modem to the factory default setting as follows
the reset button on the back of the unit. (You must continuously hold the reset button through three
cycles of LED flashing: Reset, Firmware Download Mode, and Factory Default Reset.) After the ALERT
LED has flashed for the third cycle, you have successfully reset the LAN Modem back to factory
defaults. Release the reset button.
The LAN Modem reinitializes itself and is reset to the factory defaults. All user-entered information will
be erased. Restart your computer and launch your Web browser.
Enable JavaScript via your Web browser's configuration options.
Make sure you are using the 8-pin to 8-pin cable labeled Ethernet which was provided with your 56K
LAN Modem. If you are using another 10BASE-T Ethernet (Category 5) cable, it must be a straight-
through cable.
Notify your reseller or technical support that the 56K LAN Modem has failed the self-test.
Power cycle the 56K LAN Modem. If the ALERT LED continues to flash, the 56K LAN Modem has failed
the self-test. Contact your network supplier. If the ALERT LED is not flashing, then the LAN Modem is
now operating correctly.
Check all cables and connectors to ensure that they are inserted securely.
Ensure that the incoming analog telephone line has been connected to the port labeled LINE on the
56K LAN Modem's back panel.
Disconnect any data calls currently in progress.
8
: Press and continue to hold in
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