Common Windows Error Codes and How to Fix them

Below is a list of the most common error codes that you may face while using Windows and its basic components. Some solutions have been provided for you to try to solve them. You should also note that some require the assistance of a computer technician and you should not try to fix them yourself as they could seriously damage your computer system.

Error #1

Error Message: Access Denied
Solution:

1. Ensure that you’ve entered the appropriate username and password in the field labeled “domain” for NT/2k
2. Check that the option “accept any authentication including clear text” is activated

Error #2

Error Message: Invalid Procedure Call
Solution: Dialup and Network components must be installed again

Error #3

Error Message: Stack Overflow
Solution:

1. Try cold booting your computer
2. If this does not work, the problem might come from your RAM or the Swap file

Error #4

Error Message: The system cannot find the specified device
Solution:

1. Ensure that the right modem has been selected
2. If it does not respond, try to reinstall it
3. You can also try to reinstall NCP/DUN/RAS

Error #5

Error Message: No more connections are allowed
Solution:

1. Someone else might have connected under your account
2. If you have been ghosted on the server, your Internet Service Provider can bump the ghost program off

Error #6

Error Message: Invalid Proper Value
Solution:

1. Autodial should be pointed to the correct dialler
2. Else, set up the dialler again

Error #7

Error Message: An operation is pending
Solution:

1. You should first try rebooting your computer
2. Ensure that no other program is using your modem
3. Else, press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Make sure that your computer is Spyware free

Error #8

Error Message: The port handle is invalid
Solution:

1. Select the modem’s COM port and under the Diagnosis section, open “More Info”. You should reboot your computer if you are able to get ATI responses, remove the erroneous init string or enter ATZ as the init
2. You can also reinstall your modem
3. Else press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Your Dialup Networking should be reinstalled together with its components
5. Your modem might not be working properly. You should then consult your computer manufacturer

Error #9

Error Message: The port is already open
Solution:

1. Try to reboot your computer
2. Ensure that no other program is using the modem
3. Else press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Try uninstalling the AOL Adapters in the Network Control panel and reboot your computer. Install your Dialup Adapter again
5. Remove the erroneous init string or enter ATZ as the init
6. If you have Quicken 2000, deactivate the Quicken Download Manager
7. Try installing your modem again
8. Make sure that your computer is Spyware free

Error #10

Error Message: Caller’s buffer is too small
Solution:

1. Ensure that your port is not configured to a low speed
2. In your “Port Settings”, ensure that FIFO is not set to low
3. Try reinstalling your Dialup Networking together with its components
4. If you are still having problems, contact your computer manufacturer

Error #11

Error Message: Wrong information specified.
Solution:

1. Ensure that the are no outages in your area
2. Try to enter the username and password again
3. Set up the dialler again
4. Your Dialup Networking should be installed again together with its components
5. You can also try to reinstall your modem

Error #12

Error Message: Cannot set port information.
Solution:

1. Ensure that the are no outages in your area
2. Try to enter the username and password again
3. Set up the dialler again
4. Your Dialup Networking should be installed again together with its components
5. You can also try to reinstall your modem

Error #13

Error Message: The port is not connected.
Solution:

1. Select the modem’s COM port and under the Diagnosis section, open “More Info”. You should reboot your computer if you are able to get ATI responses, remove the erroneous init string or enter ATZ as the init
2. You can also reinstall your modem
3. Else, press Ctrl-Alt-Delete and if RNAAPP loads, contact a technician to fix this problem
4. Your modem might not be working properly. You should then consult your computer manufacturer if the problem persists.

Error #14

Error Message: The event is invalid.
Solution:

1. If this problem arises while dialling up to the internet, verify that the settings of the event log have been correctly set
2. Try rebooting your system and ensure that the dialler/network settings have been correctly configured
3. Else, install RAS/DUN again

Error #15

Error Message: The device does not exist.
Solution:

1. Check that the right modem is set in the dialler
2. Ensure that you are using the right modem drivers by checking the modem diagnostics. If it’s not the case, set up the correct drivers.
3. Reinstall the dialler
4. Your modem might not be working properly. Try reinstalling it
5. You should consult your computer manufacturer if the problem persists

Error #16

Error Message: The device type does not exist.
Solution:

1. Check that the right modem is selected in the dialler
2. Ensure that you are using the right modem drivers by checking the modem diagnostics. If it’s not the case, set up the correct drivers
3. Your modem might not be working properly. Try reinstalling it
4. You should consult your computer manufacturer if the problem persists

Error #17

Error Message: The buffer is invalid.
Solution:

1. Ensure that your port speed is set to low in the modem properties
2. In your “Port Settings”, check that FIFO is not set to low
3. Reinstall the dialer again
4. Else, reinstall RAS/DUN
5. You should consult your computer manufacturer if the problem persists

Error #18

Error Message: The route is not available.
Solution:

1. Try to reboot your computer
2. Ensure that you set the right configurations for the dialer and network settings
3. Else, install the network components again
4. If you are using a LAN connection, consult your system administrator

Error #19

Error Message: The route is not allocated.
Solution:

1. Reboot your computer
2. Ensure that you set the right configurations for the dialler and network settings

Error #20

Error Message: Invalid compression specified.
Solution:

1. Try to reboot your computer
2. Else, add &K3 to the extra settings.
3. If this still does not solve the problem, add &K3
4. You can also try to reinstall the modem

Error #21

Error Message: Out of buffers.
Solution:

1. Ensure that our port speed is not too low
2. Try to install your modem again

Error #22

Error Message: The port was not found.
Solution: Try to install your modem drivers

Error #23

Error Message: An asynchronous request is pending.
Solution:

1. Reboot your computer
2. Try to install your modem drivers again

Error #24

Error Message: The port or device is already disconnecting
Solution:

1. Wait until your modem disconnects properly
2. If this operation is taking too long, reboot your computer

Error #25

Error Message: The port is not open.
Solution:

1. Reboot your computer
2. Ensure that no other program is making use of the modem

Error #26

Error Message: The port was not found.
Solution: Try to install your modem drivers

Error #27

Error Message: System cannot find specified file
Solution: You should reinstall NCP & DUN

Please note that this is not an exhaustive list of Windows error codes, and there are many more error codes that can occur in different scenarios. If you encounter a specific error code, it’s recommended to search for the code along with the specific error message to find more detailed information and possible solutions.

More Information ℹ

• Windows OS