The requested control is invalid NET HELPMSG 2191: 2 simple fixes

In the TCP/IP protocol suite, the Domain Name System is one of the protocols that provides name resolution services for computer name to IP address mapping. However, sometimes it malfunctions, resulting in errors such as The requested control is not valid for this service NET HELPMSG 2191.

DNS clients and servers work together to provide computer name to IP address mapping name resolution services to computers and users.

After installing Windows, the client service is enabled by default for client and server versions of the operating system.

Once you specify the server's IP address in your TCP/IP network configuration, the DNS client queries the server to discover domain controllers and resolve computer names to IP addresses.

Only after the server responds to the client's query and provides the IP address of the domain controller, communication can occur between the client and the domain controller and the authentication process can begin.

Follow us as we show you how to enable DNS on Windows 11 and then jump to the list of solutions for the Requested Controls Not Working for this Service NET HELPMSG 2191 issue.

How to enable DNS on Windows 11?

1. Open Control Panel and navigate to Network and Internet to find the settings we need to adjust.
2. Go to the Network and Sharing Center.
3. Click the Change Adapter Settings option to select the network to modify.
4. Right-click the network where you want to enable DNS and select Properties.
5. Navigate to the Network tab, select IPv4 and click Properties. IPv4 is the abbreviation for Internet Protocol version 4. It is the underlying technology that enables us to connect devices to the Internet and share information with them.
6. Select the radio button next to Use the following DNS server addresses and enter the preferred and backup servers. Any device connected to the Internet is assigned a unique numeric IP address, such as 99.48.

Some of the best third-party DNS servers are Google Public DNS (8.8.8.8 and 8.8.4.4), Cloudflare (1.1.1.1 and 1.0.0.1), and OpenDNS (208.67.222.123 and 208.67.220.123). Each of these service providers has a primary and secondary DNS address that can be used for connections.

Because it's easy to remember, Google's public DNS is one of the most widely used addresses on the Internet.

The fact that Google logs IP addresses that access its servers for one to two days is important because it can be used for diagnostic and troubleshooting purposes.

There may also be some persistent logs, but Google claims it does not store any personally identifiable information in its logs. Therefore, if you value your privacy, you may want to consider using a different DNS address.

What should I do if I get a NET HELPMSG 2191 error?

1. Restart DNS

1. Open the Windows search function and enter services. Click on the top result to open the service application.
2. Here, scroll down until you encounter DNS Client, then right-click on it to select Properties.
3. Click the Stop button and then click the Start button. However, if the button appears gray, go to the second solution.

You can use Microsoft Services (formerly NT Services, available on Windows platforms) to create long-running executable applications that run in their own sessions.

These services can start automatically when the computer starts, can be paused and restarted, and do not display any graphical user interface.

It's important to note that since clearing the DNS cache will delete all entries, it will also delete any invalid records, which will force your computer to repopulate these addresses the next time you try to access these websites.

These new addresses come from the DNS servers configured for your network.

2. Use the Registry Editor

1. to open the Windows search function and enter regedit in the search bar. Select the top result to open the Registry Editor.
2. Here, enter the following location and press Enter: <strong>Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNSCache\Parameters</strong>
3. Right click on a blank area and create a new DWORD or QWORD depending on your system. DWORD, short for Double Word, is a data type definition that is only available on Windows.
4. Name it MaxCacheTtl and double-click it to set the value to Decimal and 86400.
5. Repeat the same steps and create a new DWORD/QWORD named MaxNegativeCacheTtl. Set its value to 5. This way, the DNS cache will be reset every few hours.

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In the Registry Editor, users can perform the following operations: create, manipulate, delete, and rename keys and subkeys in the registry, as well as modify and delete value data.

However, if you still can't complete the above solution or it doesn't work for you, check out What to do if you can't restart your DNS client.

Why use a third-party DNS server?

DNS servers are responsible for connecting domain names to their associated IP addresses. When you first enter a domain name into your browser, your computer contacts the DNS server currently in use and asks for the IP address associated with the domain name.

The IP address is then connected to your computer, which retrieves the page for you. Your Internet Service Provider (ISP) is most likely responsible for providing the server you use.

If you are behind a router, your computer may be using the router as its DNS server, but the router actually forwards requests to servers provided by your Internet service provider.

Your computer stores DNS responses locally, which means you don't have to make a request every time you connect to a domain name you've already visited one or more times.

Once your computer determines the IP address associated with a domain name, it will retain that information for a period of time, allowing you to connect faster by skipping the request phase entirely.

As we established above, you are most likely using a server provided by your Internet Service Provider. However, you don't need to do this. Instead, you can use those operated by third-party companies.

In some cases, these DNS servers may be able to provide you with faster resolution, allowing you to connect to the domain name faster the first time you connect.

In practice, however, the actual speed difference you experience will depend on your distance from the third-party server and the speed of your Internet Service Provider's (ISPDNS) servers.

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