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How to Fix Error 421

What is the Error 421?

Error 421 is a common SMTP (Simple Mail Transfer Protocol) Outlook error message. MS Outlook is one of the best and popular email applications widely used by PC Windows users for sending and receiving emails within and outside workplaces.

It is most commonly used in offices by professionals for faster communication.

This error may occur while sending and receiving emails on the server. The error 421 messages is displayed in either of the following formats:

“An unknown error has occurred: Server error 421”

"Could not send your message. Error 421"

421 4.2.1 : (DYN:T1) http://postmaster.info.aol.com/errors/421dynt1.html

421 4.3.1 Out of disk space for temp file

421 4.3.2 All server ports are busy

421 Downstream server error

421 Fork failed

421 Greylisting enabled, please try later

“An unknown error has occurred. Subject ‘Testing’, Account: ‘pop.charter.net’, Server: ‘mail.charter.net’, Protocol: SMTP, Server Response:

’421 Message rejected’, Port: 25, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67”

Solution

Restoro box imageError Causes

Some common causes for this critical Outlook error are:

  • PST storage size exceeds 2GB file size
  • Improper ISP settings
  • Slow internet connection
  • PST file corruption
  • Trojan attack and viral infection

This is a critical Outlook error that should be resolved timely. If you delay, it may cause you a great deal of inconvenience.

The error code 421 hampers your ability to access your email account, send and receive emails, add new contacts, view emails, calendar entries, and journals. In other words, it just brings your email activities to a standstill locking you out of the account.

Further Information and Manual Repair

To resolve this error code on your system, you don’t always have to hire a professional or call the network personnel to do the job. It may be a critical error but the good news is that it is quite easy to fix. Even if you don’t have technical expertise, you can still repair it.

Here are some of the best methods to repair this issue on your system:

1. Change the Server Settings to its Maximum Limit

Try changing your server settings. Here set the inbound connections limit at the maximum limit.

  • To do this, open the Microsoft Exchange Server Administrator utility. The access path of this utility will vary depending on the installation procedure used to set up Exchange Server.
  • Once you open the MS Exchange Server Administrator utility, click the ‘Connections’ icon in the left side navigation pane. Now double click the internet mail service icon in the right side pane. As you click it, the Properties window will open.
  • Now click the ‘Connections’ tab in the Properties window and then click the ‘Advanced’ button. This will open the configuration window.
  • Here reset the number for ‘Maximum Number of Inbound Connections’ to a high number, its maximum limit. After changing the settings, close all open Exchange Server Administrator program windows to successfully complete the process.

After the process is complete, try accessing your Outlook email account again; if it works, then that’s great the error 421 is resolved. However, if it doesn’t, then the problem could be related to viral infection.

2. Download a PST Repair Tool

If the cause of the error is PST files corruption, then not only will you be locked out of your email account, you are also at risk of losing all the data stored in your email account.

However, the best way to resolve the error and ensure full data recovery is to download a reliable PST repair tool. By running a PST repair tool on your system, you can resolve the error 421 right away. It recovers your data, repairs corrupt and damaged PST files.

3. Scan Your PC with Restoro.

If viral infection and Trojans are causing the error 421 to pop up on your system, then it is recommended to download and scan your PC with Restoro.

This is an advanced, intuitive, and user-friendly PC fixer. It is not just an antivirus but also a system optimizer and a registry cleaner.

Unlike common antivirus software that only removes viruses and simultaneously slows down the system’s speed, Restoro removes all types of malicious software on your PC including malware, spyware, Trojans, and viruses, and also boosts the speed of your PC significantly.

It is safe, easy to operate, and a quick fixer. It is compatible with all Windows versions.

Click here to download Restoro and resolve error 421 today!

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Connecting a Wireless Printer to a Windows PC
Although it’s easy to set up wired printers in most cases and they have their charm, you don’t have to be around the printer if you are connected to the same network. So in this post, you will be guided on how you can install and set up a wireless printer on your Windows 10 computer. The idea here is to ensure that your Wi-Fi printer and your Windows 10 computer are connected on the same network and to do that, you need to carry out the following steps:
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  • You have to add the printer or scanner to Windows 10.
  • You have to install the printer software.
  • You have to change the default printer.
  • And troubleshoot the printer.

For more details, follow the instructions below.

Step 1: Connect your printer to the Wi-Fi network. In this step, you need to turn on your printer and look for the option to connect to a Wi-Fi network. Note that the step to connect to the Wi-Fi network depends on what kind of printer you use as well as its OEM since there will be a user interface or a Wi-Fi button that will get the job done for you. Once your printer is connected to the Wi-Fi network, you need to keep it turned on until the setup is completed. Step 2: Next, add a printer or scanner to Windows 10
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  • From there, click on the Add a printer or scanner option.
  • After that, the scanning process will begin as Windows 10 looks for the printer and once it finds it, it will display the printer in the result.
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Step 3: You have to install a printer software In this step, you need to use the driver software from the OEM even though the default printer software works since in most cases, the driver software from OEM works better compared to the default ones and offers much better functionality like ink-saving modes, and many more. Step 4: You now have to change the default printer After installing the printer software, you now have to set or change the default printer in your computer. If you have not installed any printer, the default printer in Windows is the one that saves the files. Now since you have already installed your printer, all that’s left for you to do is to change the default printer of Windows 10 to the one you installed earlier. To do that, follow these sub-steps:
  • Go to Settings and navigate to Devices > Printers & scanners.
  • From there, check the checkbox labeled, “Let Windows manage my default printer” if there are many printers. This will recommend you to use the most used printer. But if you don’t want to switch to the most used printer, then uncheck the checkbox.
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Step 5: If you have any issues with your newly installed printer, then you need to troubleshoot it One of the first basic troubleshooting you can perform to resolve the printer issue is running the Printer Troubleshooter. This built-in troubleshooter can detect and automatically fix the problem for you. To use it, follow these steps:
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Run installation assistant as administrator

This is the most simple solution that can solve problems right away and it is advised to be tried first.
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Disable antivirus and/or firewall software

Antivirus or firewall software can sometimes interfere with Windows’s update and prevent for any reason download or installation of files they consider not safe. If the first solution has not provided success turn off your antivirus or firewall software and try again to install updates by running them as administrator. Now, how many different antivirus or firewall applications are unique pieces of software it would take too much time to cover all of them but usually and most commonly if you right-click on the taskbar icon of security app most of the time you will have either option to open it and close it or simply just to snooze it for some time.

Set the compatibility

If you are still having issues with installing updates try setting compatibility mode for the installer.
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Run SFC scan

If you are still facing installation issues there is a high chance there is something wrong with Windows system files. Luckily Windows itself has a built-in tool to address these issues and fix them.
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Option 1 – via the Registry Editor

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HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows
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Option 2 – via Group Policy Editor

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What Is 0x00000050 Stop Error?

While running your Windows 7/Windows Server 2008 R2, your system suddenly stops responding out of complete randomness and you see an error message popping up which says something like this:

0x00000050 (parameter1, parameter2, parameter3, parameter4)

Solution

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The stop error 0x00000050 signifies that there’s a PAGE_FAULT_IN_NONPAGED_AREA problem. If you’ve seen this error on different occasions then you will find the parameters in the message to be varying. That is because they are dependent on your PC’s configuration. Not all Stop errors "0x00000050” occur due to a single issue.

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Further Information and Manual Repair

In order to fix this issue, you should try booting your computer to the “Last Known-Good Configuration” as listed during startup.

For this you have to follow the below-mentioned steps:

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  3. Use the up and down arrow keys to highlight “Last Known-Good Configuration” and hit enter (This method will only work if your system boot was not successfully carried out ever since you made any specific changes).
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  • Select the “Disable All Services” option.
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    nVIDIA sometimes publishes really messy drivers which can really cause some serious issues, if by any chance you managed to be unlucky enough to get this kind of driver, do not despair, roll back to the previous working version and wait for the fix. To stop Windows from doing automatic driver updates, navigate to Control Panel > System & Security > System > Advanced System Settings > Hardware > Device Installation Settings. Then choose "No (your device might not work as expected)". Once you have turned off automatic driver updates, uninstall your current driver and install the previous version from the official nVIDIA website. Reboot your system
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According to Microsoft:

“We collect information about you, your devices, applications and networks, and your use of those devices, applications, and networks. Examples of data we collect include your name, email address, preferences, and interests; browsing, search and file history; phone call and SMS data; device configuration and sensor data; and application usage.”
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Option 1 – Disable the Connected User Experience & Telemetry Service via Service Manager

Note that this option is for standalone systems, so if you’re not using one, refer to the next given options below.
  • Tap the Win + R keys to open the Run dialog box.
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  • Next, right-click on it and select Properties.
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Option 2 – Disable the Connected User Experience & Telemetry Service via Registry Editor

  • Tap the Win + R keys to launch the Run utility and type “Regedit” in the field and click OK to open the Registry Editor.
  • Next, navigate to this registry path: HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsDataCollection
  • After that, right-click on the folder named “DataCollection” and select New > DWORD (32-bit) Value.
  • Now name the new value “AllowTelemetry” and make sure that its Value data is “0” and then click on OK to save the changes made.
  • Restart your computer.

Option 3 – Disable the Connected User Experience & Telemetry Service via Group Policy Editor

If you have to disable the service related to the Universal Telemetry Client for company-managed systems, then you can do that using the Group Policy Editor.
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  • Next, set the radio button to Disabled and then click on the Apply button to save the changes made.
  • Restart your computer.

Option 4 – Run the Hardware and Devices Troubleshooter or the Performance Troubleshooter

Hardware and Devices Troubleshooter:

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error 0x800f0905Therefore we are presenting a couple of solutions that will fix your issue, it is advisable to follow them as presented since they will go from the most common to the more complex one.

Run the troubleshooter

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  4. Click on Other Troubleshooters
  5. Find the Windows Update section and click on Run
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Reset Windows update components

If the previous solution did not work we will need to do things manually. Follow the steps as presented in order to reset Windows update components.

  1. Press ⊞ WINDOWS + S to open search
  2. Type in Terminal
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  4. Click on Yes on the User account control (UAC) pop up
  5. Press CTRL + SHIFT + 2 to open Command prompt
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    regsvr32.exe browseui.dll
    regsvr32.exe jscript.dll
    regsvr32.exe vbscript.dll
    regsvr32.exe scrrun.dll
    regsvr32.exe msxml.dll
    regsvr32.exe msxml3.dll
    regsvr32.exe msxml6.dll
    regsvr32.exe actxprxy.dll
    regsvr32.exe softpub.dll
    regsvr32.exe wintrust.dll
    regsvr32.exe dssenh.dll
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    regsvr32.exe gpkcsp.dll
    regsvr32.exe sccbase.dll
    regsvr32.exe slbcsp.dll
    regsvr32.exe cryptdlg.dll
    regsvr32.exe oleaut32.dll
    regsvr32.exe ole32.dll
    regsvr32.exe shell32.dll
    regsvr32.exe initpki.dll
    regsvr32.exe wuapi.dll
    regsvr32.exe wuaueng.dll
    regsvr32.exe wuaueng1.dll
    regsvr32.exe wucltui.dll
    regsvr32.exe wups.dll
    regsvr32.exe wups2.dll
    regsvr32.exe wuweb.dll
    regsvr32.exe qmgr.dll
    regsvr32.exe qmgrprxy.dll
    regsvr32.exe wucltux.dll
    regsvr32.exe muweb.dll
    regsvr32.exe wuwebv.dll
    netsh winsock reset
    net start bits
    net start wuauserv

Well, that was a lot of typing or copy and pasting line by line followed by ENTER after each one but hopefully, your issue is solved. These provided solutions fixed most users' issues with this error but if for some reason this is not the case for you, move to the next step.

Run the SFC scan

If you are still having 0x800f0905 error after previous attempts do the following:

  1. Press ⊞ WINDOWS + S to open search
  2. Type in Terminal
  3. Select Run as administrator
  4. Click on Yes on the User account control (UAC) pop up
  5. Press CTRL + SHIFT + 2 to open Command prompt
  6. Type in sfc /scannow and press ENTER
  7. Wait for the scan to finish
  8. Reboot the computer

Perform a system restore

If for any reason previous solutions have not provided you with the solution we will try to fix the issue by performing system restore.

  1. Press ⊞ WINDOWS + S to open search
  2. In the text box type in Create a restore point
  3. Click on the closest match in search results, should be Create a restore point
  4. Click on System Restore or on Next if there are no points created
  5. Choose to restore a point from the list and click on next
  6. Review settings and click on Finish
  7. Wait for the process to finish and for the computer to restart

Manually install update

If for any reason Windows still cannot install the update, try installing it manually.

  1. Go to Windows 11 update history and find the Knowledge base (KB) number for the latest version
  2. Go to the official Microsoft Update Catalog
  3. Paste the KB number in the search box and press ENTER
  4. Click on DOWNLOAD
  5. Double click on the downloaded file to launch the installer
  6. Follow on-screen instructions and install the update

Perform Windows 11 reset

If nothing worked, reset your Windows 11 to its factory settings to fully repair and reset the whole operating system.

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Fix MSVCR71.dll is missing in Windows 10
The program can’t start because MSVCR71.dll is missing from your computer, Try reinstalling the program to fix this problem.
If by any chance you have encountered this error know that you are not alone and that this is a solvable error. In this guide, we will show you how to fix this error. Usually, the MSVCR71.dll missing error is met when a new application is installed. So let us dive right into it and solve it.
  1. Reinstall application

    If only a certain application is reporting this error, try reinstalling it, there is a high possibility that by some mistake application was not properly installed and corrupted or removed the MSVCR71.dll file. If this is the case, reinstallation will help.
  2. Check recycle bin

    like mentioned above, if the application has by mistake deleted the file, open recycle bin and try to locate it there. If this is the case, restore it from recycle bin and everything should be back in normal working conditions.
  3. Download a new version of the file

    If the previous 2 methods failed and you still get the missing error, try downloading the file from Microsoft and placing it in C:\Windows\SysWOW64
  4. Reinstall C++ redistributable

    Having an incorrect C++ redistributable package can be an issue of the problem, get the latest version from Microsoft and reinstall it.
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