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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Technical Details and Manual Removal (Advanced Users)

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Files: %LOCALAPPDATA%\Smartbar\Application\Lrcnta.exe %LOCALAPPDATA%\Linkury\Application\Linkury.exe %LOCALAPPDATA%\Smartbar\Application\QuickShare.exe %USERPROFILE%\Local\AppData\Smartbar\Application\Delta.exe %ALLUSERSPROFILE%\WCService\WCService.exe %LOCALAPPDATA%\Smartbar\Application\Luckysave.exe %LOCALAPPDATA%\Smartbar\Application\Muvic.exe %LOCALAPPDATA%\Linkury\Application\Smartbar.exe %LOCALAPPDATA%\Smartbar\Application\SavePass.exe %LOCALAPPDATA%\Smartbar\Application\SafeFinder.exe %LOCALAPPDATA%\Smartbar\Application\WhiteSmoke.exe %LOCALAPPDATA%\Smartbar\Application\BrowserHelper.exe %LOCALAPPDATA%\Smartbar\Application\SnapDo.exe %LOCALAPPDATA%\Smartbar\Application\ProductsRemovalTool.exe %LOCALAPPDATA%\Smartbar\Application\MagicBox.exe Registry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\Linkury_RASMANCS HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\Linkury_RASAPI32 HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\Linkury_RASMANCS HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\Linkury_RASAPI32 HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION, value: Linkury.exe HKEY_CURRENT_USER\Software\Microsoft\Installer\Products\C5670CA607D1C7C4AA305DE018401AA3 HKEY_CURRENT_USER\Software\Microsoft\Installer\Features\C5670CA607D1C7C4AA305DE018401AA3 HKEY_CURRENT_USER\Software\Linkury HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Shared Tools\MSConfig\startupreg\Browser Infrastructure Helper HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LinkurySmartBar.LinkurySmartBarBandObject HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LinkurySmartBar.LinkuryMenuForm HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LinkurySmartBar.DockingPanel HKEY_LOCAL_MACHINE\SOFTWARE\Classes\LinkurySmartBar.BandObjectAttribute HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, value: Linkury Chrome Smartbar HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\Mntz_Installer_RASAPI32 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\Mntz_Installer_RASMANCS HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\Mntz_Installer_RASAPI32 HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\sulpnar HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\Stpro HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Stpro HKEY_LOCAL_MACHINE\SOFTWARE\mtPlusdax HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\mtPlusdax
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Option 1 – Try to disable Developer Mode

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Option 2 – Try to run the Windows Update Troubleshooter

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Option 3 – Try restarting various Windows Update-related services and components

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    • net start cryptsvc
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Fix Page Fault in Non-Paged Area in Windows 10
Page Fault in Non-Paged Area is a blue screen error usually happening with faulty drivers but it can come from different issues like faulty RAM. In this short article, we will cover usual ways on how to approach and solve this error.

Solving Page fault in Non-Paged Area

Page Fault in Non-Paged AreaRollback using system restore

Simple and easy solution, roll back to the previous system restore point where Windows was stable and working.

Fix Page Fault in Non-Paged Area using device manager

  1. Press ⊞ WINDOWS + X to open the hidden menu
  2. Click on device manager
  3. Find a device with a question mark and right-click on it
  4. Click on the rollback driver button

Fix via command prompt

  1. Press ⊞ WINDOWS + X to open the hidden menu
  2. Click on command prompt (admin)
  3. Inside command prompt type in SFC / scannow and press ENTER
  4. Wait for the process to be finished and then reboot the PC

Fix via DISM tool

  1. Press ⊞ WINDOWS + X to open the hidden menu
  2. Click on command prompt (admin)
  3. Inside command prompt type in DISM /Online /Cleanup-image /Restorehealth and press ENTER
  4. Wait for the process to be finished and then reboot the PC

Page fault in Non-Paged Area via a dedicated tool

Sometimes manual and provided solutions just simply cannot cut it because the issue is triggered also with something else and not just a single issue. Use DRIVERFIX to fix this specific issue with a single click.
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Disable Taskbar on the second display
If you have a dual monitor setup on your Windows 10 computer and you mostly use the second screen when you are presenting something, this makes the Taskbar completely unnecessary and is not really required. So if you are using your computer generally and do not want the taskbar on your second screen, read on as this post will guide you in disabling Taskbar on your second display. The good thing is, Windows comes with a built-in feature to disable Taskbar on your second screen or projector connected to your computer. In this post, you will be guided on how you can hide or disable the Taskbar from the second monitor in Windows 10. This post is coming in handy especially if you are using projectors or multiple displays. Refer to the steps given below to disable Taskbar on the second display in Windows 10. Step 1: Go to Settings and click on Taskbar from the left menu. Step 2: After that, scroll down to lo look for Multiple Displays. Step 3: Next, turn off the toggle labeled, “Show taskbar on all displays”. Note: After completing the steps given above, it will disable the Taskbar on all the secondary displays. Bear in mind that these settings will work only if you are running a second screen in Extended mode. Contrariwise, if you are in the Duplicate mode, this setting will not work but you can always set your Taskbar to Autohide so that it won’t be displayed.

On the other hand, if you are facing some issues in finding which screen is primary and which one is secondary, refer to these steps:

Step 1: Go to Settings and select System. Step 2: Next, from the left menu open Display. Step 3: From there, select the desired display and make it the primary one as required by your setup.
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What to do if Windows Media Player is not playing the Music Playlist in Windows 10
Many users would probably agree that the Windows Media Player, in most cases, is a lot better than the Groove. Although it is understandable why the Groove Music app was created, it may be time for Microsoft to bring its focus back on Windows Media Player. Even more, so that some users are experiencing an issue where they were not able to play their playlist in the Windows Media Player on their Windows 10 PCs. One particular user claimed that when he removed his music from the C drive and transferred them to the C drive for some reason he didn’t state. Right after he did that, any attempts to play songs in the Windows Media Player just don’t seem to work. Transferring music to a different location shouldn’t cause any issue but for some unknown reason, it did. According to security experts, the reason why the Windows Media Player didn’t play the playlist is that it still believes that the songs are still located in the C drive when they’re really not. So the question here is, how can you get the Windows Media Player to recognize the exact and correct location of the songs? Worry not, for this post will show you how exactly you can do that. Carefully follow each one of the instructions given below to fix the Windows Media Player issue.

Option 1 – Try running the WMP Troubleshooters

In case there are any issues with the Windows Media Player, you can always count on the WMP Troubleshooters to fix the problem for you. These built-in troubleshooters, namely, Windows Media Player Library and Windows Media Player DVD Troubleshooters can help you fix the problem, so run them both and see if you can now play those songs or not.

Option 2 – Try rebuilding the Windows Media Player Database

If the first option didn’t work for you, you might have to rebuild the Windows Media Player database. You can do this by following the steps below.
  • Tap the Win + R keys at the same time to open the Run dialog box.
  • After that, copy and paste this command in the field: %userprofile%Local SettingsApplication DataMicrosoftMedia Player
  • Once you’ve pasted the command, hit Enter then you will see a new File Explorer which is the folder for the Media Player. You will have to delete every item in this folder, except for the folders. Meaning to say, you must only delete the individual contents inside but not the folders.
  • Now launch the Windows Media Player again and watch as it rebuilds the music library automatically.
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