Troubleshooting Problems Communicating on the Internet
Summary:
This article describes how to troubleshoot problems communicating with
servers on the Internet using an Internet browser, ftp, or Telnet. This
article assumes that you are able to connect and log on to CiNet
successfully.
More Information:
You may experience problems communicating with a server on the Internet
for any of the following reasons:
- The server is not functioning properly or has been temporarily
removed from the Internet.
- Your Internet browser is not configured properly.
- The TCP/IP configuration for your dial-up connection to CiNet
is incorrect.
- CiNet's Domain Name Service (DNS) server is not working
properly.
To determine and resolve the problem you are experiencing, follow the
procedures in each of the following sections in order. After you finish
each procedure, check to see if you can communicate with servers on the
Internet successfully.
Try a Known Good Server
If you cannot communicate with a specific server on the Internet, attempt
to connect to the CiNet Web site using its fully qualified domain name
(FQDN):
http://www.cinet.net
An FQDN consists of a host name and a domain name. If you can connect to
the Microsoft Web site using its FQDN, your computer's TCP/IP
configuration is correct. If you are able to connect to the Microsoft Web
site and you are unable to connect to another specific Internet site after several attempts, the other site may not be
functioning properly or may be temporarily removed from the Internet. Try
to connect to some different Web sites. If you are not able to connect to
any Web sites, there may be a problem with your Internet browser's configuration or with the TCP/IP
configuration for your dial-up connection to your ISP.
Verify Browser Configuration
Verify that your Internet browser is configured to connect to the Internet
using your dial-up connection to your ISP and that your Internet browser
is not configured to connect through a proxy server.
Enable the Use Default Gateway On Remote Network Option
If you connect to a local network using a network adapter and to CiNet
using a modem simultaneously, configure your dial-up connection so that
any routing conflicts are resolved in favor of your dial-up connection to
CiNet. To do so, follow these steps:
- Click Start, point to Programs, point to Accessories, and then
click Dial-Up Networking.
- Click the phone book entry for CiNet in the Phonebook Entry
To Dial box.
- Click More, and then click Edit Entry And Modem Properties.
- Click the Server tab, and then click TCP/IP Settings.
- Click the "Use default gateway on remote network" check box to
select it, and then click OK.
- Click OK.
Check the Transfer Light
If you connect to a local network using a network adapter and to CiNet
using a modem simultaneously, a conflict between your network adapter and
your modem can prevent your modem from sending information to servers on
the Internet. To verify that TCP/IP packets are being routed through your modem to your ISP, follow these
steps:
- Connect and log on to CiNet.
- Right-click the Dial-Up Networking Monitor icon on the
taskbar.
- Click Open Dial-Up Monitor, and then click the Preferences
tab.
- Under Show Status Lights, click "As a window on the desktop."
- Use the PING command to cause your modem to send information.
To do so, type the following command at a command prompt:
ping <IP address>
where <IP address> is the IP address of a known good server
on the Internet. If you do not know the IP address of a server on
the Internet, use the IP address for ftp.microsoft.com,
198.105.232.1.
Dial-Up Networking Monitor shows the modem status lights in a window. If
the transfer (Tx) light in Dial-Up Networking Monitor flashes when you
ping a server on the Internet, TCP/IP information is being routed through
your modem to your CiNet.
If the transfer (Tx) light in Dial-Up Networking Monitor does not flash
when you ping a server on the Internet, packets are not being routed
through your modem. Verify that the IP address assigned to you by CiNet
for your dial-up connection is not the same as the IP address for your network
adapter or loopback driver (if installed). Also, the IP address of your network
adapter or loopback driver should not be on the same network as the IP address
assigned to you by your CiNet for your dial-up connection.
To display Windows NT TCP/IP settings for all network adapter and modem
connections, follow these steps:
- Connect and log on to your CiNet.
- Type "ipconfig /all" (without quotation marks) at a command
prompt.
The address for a modem connection is displayed as "NDISWAN<x>
adapter" where <x> is a number. The default gateway for the
NDISWAN<x> adapter is the same as the IP address; this is normal and
by design. More than one NDISWAN<x> adapter may be displayed. Any NDISWAN<x> adapters not currently in use
display zeros for the IP address. Verify that the TCP/IP settings for your
network adapter and your dial-up connection are not in conflict.
To change the TCP/IP settings of your network adapter or loopback driver,
start the Network tool in Control Panel. The Network tool is only for your
network adapters. When you are configuring the IP address for your Dial-Up
adapter, all configuration should be performed in the Dial-Up Networking tool.
Check the Receive Light
Verify that a response is returned from the server on the Internet that
you are trying to communicate with. To do so, follow these steps:
- Connect to CiNet.
- Right-click the Dial-Up Networking Monitor icon on the
taskbar.
- Click Open Dial-Up Monitor, and then click the Preferences
tab.
- Under Show Status Lights, click "As a window on the desktop."
- Use the PING command to cause your modem to send
information.
To do so, type the following command at a command prompt:
ping <IP address>
where <IP address> is the IP address of a known good server on the
Internet. If you do not know the IP address of a server on the Internet,
use the IP address for ftp.microsoft.com, 198.105.232.1.
Dial-Up Networking Monitor shows the modem status lights in a window. If
the receive (Rx) light in Dial-Up Networking Monitor does not flash when
you ping a server on the Internet, packets are not being received from
your CiNet.
If the receive (Rx) light in Dial-Up Networking Monitor flashes when you
ping a server on the Internet, but you still cannot connect to the server
using its FQDN, there may be a name resolution problem.
Test Name Resolution
A Domain Name Service (DNS) server provides host name resolution. If you
cannot connect to a server on the Internet using its fully qualified
domain name (FQDN), there may be a problem with the DNS configuration of
your dial-up connection to CiNet or with your CiNet's DNS server.
To determine if there is a problem with the DNS configuration of your
dial-up connection to CiNet, follow these steps:
- Type "ipconfig /all" (without quotation marks) at a command
prompt to display the IP address of your DNS server. If the IP address for
your DNS server is not displayed, it is 208.166.208.73.
- Verify that you can communicate with your DNS server by
pinging your DNS server's IP address. You should see a reply similar to
the following:
Pinging <###.###.###.###> with 32 bytes of data:
Reply from <###.###.###.###>: bytes=32 time=77ms TTL=28
Reply from <###.###.###.###>: bytes=32 time=80ms TTL=28
Reply from <###.###.###.###>: bytes=32 time=78ms TTL=28
Reply from <###.###.###.###>: bytes=32 time=79ms TTL=28
where <###.###.###.###> is the IP address of the DNS server.
If you can ping the IP address of your DNS server, but cannot connect to a
server on the Internet using its FQDN, your DNS server may not be
resolving host names properly. At this point try the secondary DNS
server which is 208.166.208.77.
When you have verified the correct IP address for your DNS server, update
the TCP/IP settings for your dial-up connection to CiNet. To change or
add a valid IP address for your DNS server for a Dial-Up Networking
phonebook entry, follow these steps:
- Click Start, point to Programs, point to Accessories, and then
click Dial-Up Networking.
- Click the phone book entry for CiNet in the Phonebook Entry
To Dial box.
- Click More, and then click Edit Entry And Modem Properties.
- Click the Server tab, and then click the TCP/IP Settings
button.
- Click Specify Name Server Addresses, and then type the correct
IP address in the Primary DNS box.
- Click OK, and then click OK again.
Provided by Microsoft
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