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Monday, July 19, 2021

Network connection problems (1)

Network connection problems (1)


In the properties of local connection, only the sent packets are flashing, but not the received packets. What's the matter? All aspects of network connection are normal( Local area network (LAN)


In general, we will encounter the following N situations. Do you have your kind


The modem is not working.


Cause: the modem is not compatible.


Solution: if another computer has Internet access, check the list of compatible modems. To find hardware supported by the windows operating system, visit the windows directory on the Microsoft website.


Cause: the modem is not properly connected or is turned off.


Solution: verify that the modem is properly connected to the correct port on the computer. If the modem is external, verify that the power is on.


Unable to connect to Internet service provider (ISP).


Cause: the ISP server is not running.


Solution: ask your ISP to verify that the remote access server is running.


Reason: no valid user account, or no remote access.


Solution: ask if your ISP has established your user account and if you have remote access rights.


Reason: dial the wrong number, or dial the correct number but forget to dial the external access number, such as 9.


Solution: verify that the number dialed is correct.


Reason: the modem could not negotiate with the server's modem.


Solution: try to use the same type of modem as the server uses.


Cause: there is a problem with the modem cable.


Solution: don't use the 9 to 25 pin converter that most mouse hardware comes with, because some of them can't transmit modem signals. For security reasons, a dedicated converter should be used.


Reason: the telephone line (in a hotel room, for example) does not adapt to the speed of the modem.


Solution: choose a lower rate (BPS) (or apply to the hotel manager for a direct dial line).


See also: changing the maximum speed of the modem port.


Reason: the line you are trying to use is digital.


Solution: most modems can only use analog phone lines. Verify that an analog phone line is installed, or if a digital phone line is installed, verify that the server and client have a digital modem.


When trying to connect, I received a message that the ISP server did not respond.


reason:


At higher rates, the modem is not compatible with the server's modem.


There is a lot of interference on the phone line, which prevents the modem from connecting at a higher BPS rate.


There is some kind of switching device between the client and the server that prevents the two modems from negotiating at a higher BPS rate.


Solution: tune the modem to a lower rate (BPS).


See also: changing the maximum speed of the modem port.


Cause: the ISP server is not running.


Solution: ask your ISP to verify that the server is running.


The modem always connects at a rate lower than the specified rate (BPS).


Cause: the modem and telephone line are not working properly. Too much interference on the telephone line will cause the conversation to be interrupted.


Solution: you can use modem diagnostics to confirm that the modem is operating properly.


Reason: the line quality is not good enough.


Solution: ask the telecom company to verify the quality of the line.


Reason: the line being dialed affects the speed.


Solution: if you can use more than one number to connect to your ISP, try another number to see if the speed has improved.


Reason: modem software needs to be updated.


Solution: contact the manufacturer of the modem for an updated version of the modem software.


The conversation with ISP on the network is often disconnected.


Cause: call waiting is interfering with your connection.


Solution: verify whether the phone has call waiting function. If so, disable call waiting and try calling again.


Cause: the ISP has disconnected from you due to inactivity.


Solution: please try calling again.


Reason: someone answers the phone. When you pick up the phone, the connection is automatically disconnected.


Solution: please try calling again.


Cause: the modem cable is disconnected.


Solution: verify that the modem cable is properly connected.


Reason: modem software needs to be updated.


Solution: contact the manufacturer of the modem for an updated version of the modem software.


Reason: because ISP has changed the settings on the server, you need to change your modem settings.


Solution: contact your ISP system administrator to verify your modem settings.


Connection abnormally disconnected.


Cause: the ISP server is not running.


Solution: ask the ISP system administrator to verify that the server is running.


reason:


The modem could not negotiate correctly with the modem of the ISP server.


The computer's serial port cannot keep up with the speed you selected.


Solution: try connecting at a lower initial port speed.


Reason: modem software needs to be updated.


Solution: contact the manufacturer of the modem for an updated version of the modem software.


Received a hardware error while trying to connect.


Reason: the modem is turned off.


Solution: verify that the modem is turned on. If the modem is turned off, turn it on and redial.


Cause: the modem is not working properly.


Solution: enable modem logging to test the connection.


Cause: the cable is not compatible.


Solution: if your modem communicates through a "terminal" instead of a "network connection", the cable connecting your modem to your computer may not be compatible. You need to install a compatible cable.


Conflicts between serial ports cause connection problems.


Cause: serial port conflict.


Solution: COM1 and COM3 share interrupt request (IRQ) 4. Com2 and COM4 share IRQ 3. Therefore, for serial communication, COM1 and COM3 cannot be used at the same time, and com2 and COM4 cannot be used at the same time. For example, you cannot use "terminal" on COM3 while using "network connection" on COM1.


The same rule applies to the use of the mouse while using other serial communication programs, such as "network connection" or "terminal" programs. This rule does not apply if a smart serial adapter, such as a digiboard serial card, is used.


"No response" message received when trying to connect using ISDN.

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