Error 651 usually occurs when connecting to the Internet through a WAN miniport (PPPoE) in operating rooms. Windows systems 7 and 8. Its counterpart in the Windows XP operating system was error 678, and in Windows Vista – 815.
In any case, no matter how the error is called, its essence is the same - a connection error when starting a high-speed connection on Windows 7 and 8 to connect a computer to the Internet using the PPPoE protocol.
Let's look at a few reasons why error 651 may occur.
Checking cables
First you need to check everything network cables, connections and power to all network devices: modem, router, Wi-Fi adapters. See that the cables are not broken, all devices are connected to the network. To ensure that there is no contact, disconnect the network cables from network card computer, router, modem and plug them back in. If you are using PPPoE via wireless connection, make sure you have Wi-Fi enabled on your laptop or computer.
Create a high-speed connection
You can also try to fix error 651 by deleting and creating a new high-speed PPPoE connections. To do this, in the tray, click right click mouse over the network icon and go to .
Next, go to the tab, there we select the high-speed connection on which error 651 occurs, right-click on it and click "Delete".
To create a new connection in "Network Control Center..." follow the link "Setting up a new connection or network".
Choose an item "Internet connection" and click "Next".
In the next window, click on "High Speed (with PPPoE)".
Enter "Username" and "Password" and click "Connect".
Unchecking the TCP / IPv6 protocol can also help to remove error 651. To do this, go "Network Control Center and public access» – "Change adapter settings". Then right-click on the high-speed connection and go to "Properties". Go to the "Network" tab and uncheck the box "Internet Protocol Version 6", click OK .
If error 651 still appears, move on.
Multiple NICs
If you have two network cards, then this can also cause error 651. For example, you have a home connected to the second network card. the local network or a cable from another provider. Try disabling the second network card, or the one that is not being used.
Connection blocking
The cause of error 651 can also be an antivirus or Windows firewall. They may simply block the PPPoE connection. Disable the security system for a while.
Right-click on the antivirus icon in the tray and select the item "Managing Avast Screens", then select any value. If you have another antivirus installed, look for a similar function in it.
To disable the firewall in Windows 7, read the following article.
Setting up your modem or router
If you have a modem, router or router installed, then you need to check its settings. In order to enter the router settings, in address bar browser, enter http://192.168.1.1 or http://192.168.0.1, depending on the manufacturer. Next, a window for entering a username and password will appear. We fill in these fields, by default you need to enter admin in each field. Next, we look to see if the username and password match, the type of connection and the method of connecting to the Internet. It is better to reset all settings to factory settings, and configure the equipment in accordance with the recommendations of the provider. Then reboot your device.
Also check that, say, on the router, all the necessary indicators are lit. Which flashing green light is responsible for what, you can read in the instructions for the device.
Problems on the provider's side
Internet connection problems can also be from the provider. Call tech support and ask them to check the line. Maybe they'll give some more useful advice. But to solve the problems that have arisen with your home network, or teach you how to tune network devices they definitely won't.
Registry Editor
Another way that can help solve the problem with error 651 is to change the TCP / IP settings in the registry editor. To do this, in the search bar of the Start menu, write "regedit" and press "Enter".
The registry window opens. We go through the following branches: HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/services/Tcpip/Parameters.
Then right-click on an empty space and select from context menu parameter "DWORD (32 bits)".
We name the parameter "EnableRSS" and set its value to "0".
In the same way, we create a parameter called "DisableTaskOffload" and set its value to "1". Look, maybe such a parameter is already there, then just change the value to "1".
Close Registry Editor and restart your computer.
Perhaps one of the methods will help you solve the problem that causes error 651 when connecting to the Internet.
Rate article:Any user who encounters system error, and even more so when the connection failed with error 651, he is perplexed and confused, not understanding the procedure in such situations.
When the message “the modem or other communication device reported an error” appears on the screen, negligent operators and computer equipment manufacturers are remembered.
In fact, most errors can be fixed on their own and are not critical. To fix an Internet connection failure with error 651, you need to perform a few simple operations with a preliminary clarification of the cause.
You should be aware that error 651 is in no way dependent on the provider, any client of Rostelecom, Dom.ru, MTS, Intersvyaz and other providers may encounter a similar situation.
Why does the operating system report that the connection failed with error 651
Error message 651 appears if the modem does not work correctly ( wifi adapter), violation of the connection with the provider's server.
The most common reasons are:
- Violation physical connection(cable damage, connector broken, network card, modem out of order).
- The operating system has incorrect settings for the network connection (perhaps due to a system failure or user error).
- Carrying out preventive maintenance on the lines of the provider.
But the key, and most common, reason is incorrect user operations with system settings. This means that the elimination is subject to the user himself.
Procedure for identifying the cause
First you need to carry out a small diagnostic, which already at this stage can eliminate the occurrence of an error:
Restart your computer or laptop.
Unplug your router or modem for 15 minutes. After a pause, turn on the device again by checking the connectors. It is required to wait until the device boots up and enters the normal mode of operation.
Inspect the cable connecting the router/modem to the computer for damage. Pull the plug out of the network card connector and insert it back until it locks into place.
If there are 2-3 network cards with Ethernet connectors, it makes sense to check the operation of each by rearranging the plug and observing changes in the network status on the indicator located on the screen near the clock.
Check the connection with the router via Wi-Fi channel using a tablet, smartphone.
In Dispatcher Windows devices find the network card, remove the device and perform a system configuration update. If the network card is detected again, install the latest version of the drivers by downloading them from the manufacturer's official website.
Modem reports error 651 with whole cable
If you managed to connect to the Internet from other devices and go, for example, to a page, you can already congratulate: the router or modem is working stably, and there are no restrictions from the operator.
To fix a system error:
- When connecting via ADSL
With stable signals LED indicators on a DSL device, you need to look at the modem settings:
- VPI/VCI parameters (to do this, contact the call center of the operator).
- Bridge connection type.
Attention: error 651 may occur due to the fact that the cable connection between the router and the modem was made, followed by the creation WiFi networks– you need to delete the connection. When transmitting information, these devices often use different protocols and can lead to conflict.
- At pppoe connecting
If Win7 is installed:
- create a new connection. In the Control Panel, find the "Network and Internet" section and select "Network Connections". Next, hold the sequence of clicks "Create a new connection or network" - "Internet connection" - "PPPoE". A data entry form will open account, usually they need to be found in the contract with the Internet provider. When entering, you should pay attention to the layout and the language used, because. the main reason for failures is the presence of erroneous characters in the login and password.
Update the raspppoe.sys file, which is responsible for managing connections over this protocol. The file has the following location path "C:\Windows\System32\Drivers". Open the folder, find the file, give it a different name. It is not recommended to delete, by the reverse procedure of renaming, you can return the previous settings. In the selected folder, copy the file of the same name, which can also be found on another computer (provided there is no error 651 on it either). Restart your operating system and try connecting again.
Only in this case, if it was not possible to resolve the connection failure with error 651 on your own, you should contact the technical support of the Internet provider and make a request for a check or call a specialist.
Connection Failed with Error 651: Fix in Windows 7,8,10
Error messages when connecting to the Internet haunt even today's high-speed connections. Often such problems are noticed by Windows users, where each failure has its own digital code. With its help, the user has to independently find the problem and its causes.
What to do if the computer does not connect to the Internet
Your first action, when the modem or other communication device reports an error, is to check the physical integrity of the connection. Cables between personal computer, modem, router and socket (or cable entry point into the apartment) should be checked for damage. The cause of the problem may be the loss of contact from the connector. After checking the connectors, try starting the connection again. A recurring situation indicates that there is a problem at the software level. Write down or memorize the digital code in the message.
Whether you are using a vpn or pppoe connection, there is a common set of three-digit numeric codes to determine possible cause failure. The code itself does not provide accurate information, because the problem may be a hardware malfunction or an incorrect configuration. software, and sometimes in the restrictions on the part of the provider. The purpose of the digital code is to narrow options which you can check yourself. Error 651 when connecting to the Internet, for example, means that the problem is in the high-speed PPPoE method or its equivalent.
What is error 651 when connecting to the Internet
In operating rooms Windows systems Vista and earlier a similar situation had the code 678 and 815. New code has been assigned since Windows 7. This message appears with the text that it is impossible to use the WAN Miniport (PPPoE) to access the provider's services. The failure may be on your side - in the modem or the configurations of the connection itself. ISP network outages will show the same failure. The only fact reported by the code is that there is no internet connection. Connection failure with error 651 resolves itself if the devices and cables used are not damaged.
Solutions for this problem
Start diagnosing and troubleshooting a failure with code 651 by checking the antivirus or built-in firewall settings. The connection could be in the list of suspicious connections. You will have to manually release the lock. If the message continues to appear, turn off all anti-virus programs in sequence, and also add your Internet access to the list of trusted connections for the firewall and anti-virus. Error 651 when connecting to the Internet often disappears after correct setting protective programs.
Check the settings of the Internet access itself, or delete and recreate it manually so that the connection error 651 disappears. You should have the instructions provided by the provider when concluding the contract. To create a connection again use Windows tools. In the main menu, find the creation of a new network connection: You are interested in high-speed (DSL, cable modem) PPPoE. The creation and configuration wizard will prompt you to enter the provider's data.
Checking the reasons for code 651 can be done by the provider at the request of the client - send a written request or call the support service. After checking the port assigned to your contract and the equipment on the line, you may be asked to look at the parameters of the modem or router. Access to such settings is made by entering the address 192.168.x.x in the browser. The last digits of the modem address, login and password are specified in the contract, or they are reported by the support service. In the Internet or specifically WAN section, you can see the current settings.
Video: how to fix error 651 in Windows
Connecting via WAN Miniport (PPPoE)…
Error: 651: The modem or other communication device reported an error.
Description of error 651:
Error 651 occurs on Windows 7 and 8 operating systems when trying to connect to the Internet using the PPPoE protocol. Error 651 is similar to errors 678 in Windows XP and 815 in Windows Vista.
Reasons for error 651:
- Failure of the service responsible for the "High-speed connection" (RASPPPOE failure). It is eliminated by recreating the "High-speed connection".
- Connection blocked by a firewall, firewall or antivirus.
- Failure or incorrect configuration of the router, ADSL modem.
- If the ADSL modem: is configured as PPPoE and not BRIDGE.
- If the ADSL modem: VPI and VCI parameters are incorrect.
- Faulty Ethernet cable between modem (router) and network adapter computer.
- Damaged telephone pair.
- Problems on the side of the provider.
Solution 1: Recreate the connection
Sometimes the problem that causes error 651 lies in the failure of the service responsible for high-speed connection (RASPPPOE).
It's easy to treat. It is necessary to delete the previously created high-speed connection (in our case it is called Rostelecom), and create it again. To do this, you will need documents from your provider containing a username and password to access the Internet.
Let's get started.
Open Network and Sharing Center. In the left menu, find and follow the link called Change adapter settings.
In the window that opens, find your network connection and delete it. 
After you have deleted the network connection, go back to Network and Sharing Center.
Create a new connection.
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Click on "Set up a new connection or network". In the window that opens, select the item Connect to the Internet and click the "Next" button. 
Perhaps the system will offer you a choice, depending on which network interfaces are present in the system. But we are interested in "High-speed connection (PPPoE)".
Immediately after selecting it, a prompt will open to enter:
- Username
- Password
- Connection name
Fill them out in accordance with the agreement of your provider. 
Solution 2: Disable Firewall and Firewall
There is a high chance that your connection may be blocked by a firewall antivirus program, or the built-in Windows Firewall.
Let's look at disabling both defenders with an example Kaspersky Internet Security and Firewall Windows 7.
Open the Kaspersky window, in the lower left corner, you can see a gear that will take you to the settings.
Depending on the version of Kaspersky, the interface may have some differences. But the principle is the same.
Also, if you have a different antivirus, the principle is the same. You just need to find similar settings for yours.
Now turn off the built-in Windows Firewall.
Click the button Start and in the search field write: Firewall. Before you finish typing, you will see the result of your actions.
Now, we got a window, as in the screenshot below. Here we have two simple options.
- Just turn off the firewall
- Reset its settings to default if disabling doesn't help.
Let's try to turn it off.
Now that the antivirus firewall and the built-in Windows Firewall are disabled, try connecting again.
If this helps, you will have to fine-tune both programs. Because you can't leave. If you're not sure you can do it yourself, ask a more experienced friend to help you.