Why does the Error pii_pn_b491d1d84f001d28157d Occur in Outlook?

This issue occurs when a user tries to connect to the mail server via SSL encryption, and the connection does not establish. Moreover, it could be possible that SSL encryption is disabled for the email account. There are two types of encryptions provided by the SMTP servers for sending and receiving emails, i.e., SSL and TLS. If one encryption does not connect due to incorrect settings, the mentioned error can appear.

Now, I will explain what happens when this error occurs.

What Happens When Outlook Error pii_pn_b491d1d84f001d28157d Occurs?

When this error occurs in Outlook, the following symptoms can easily be seen:

  • The Windows OS starts to crash irregularly.
  • Applications stop responding, and the device needs to restart.
  • The Mouse and Keyboard take too long to respond.

Here, I have explained the symptoms of Outlook error. In the next section, I will provide the best solutions to dissolve the above-mentioned error.

6 Easy Methods to Fix Error pii_pn_b491d1d84f001d28157d

Microsoft Outlook pii_pn_b491d1d84f001d28157d error happens on windows 10, showing the issue with Outlook Express or Windows Mail. This mistake generally occurs because of the contention between SMTP Servers at the point when a client attempts to send letters without the appropriate setting of the record.

The below content will figure out 6 simple techniques to explain or solve the pii_pn_b491d1d84f001d28157d Microsoft outlook error code that may help you fix this pii_pn_b491d1d84f001d28157d Microsoft outlook error code.

Method 1: Solving pii_pn_b491d1d84f001d28157d Error Through Programs and Features Tab.

  • Most importantly, attempt to fix pii_pn_b491d1d84f001d28157d Outlook express error through program and highlights via auto-fix apparatus as follows:
  • Click-on Windows catch and search program and highlights (you can likewise open control board and go to projects and highlights)
  • Quest for Microsoft Office 365 in projects and highlights. (or then again select any office-appropriate application)
  • At the head of the Programs and Features window, click on alter select “Fix” and adhere to the directions on the screen.
  • When it gets done with handling, restart Outlook and check if the pii_pn_b491d1d84f001d28157d Outlook express error code is taken out; if it perseveres, at that point, attempt strategy 2.

Method 2: Check Worker Prerequisite Setting as Follow:

  • Open Microsoft Outlook from applications.
  • Open File.
  • Record Settings.
  • select a record from Microsoft Outlook
  • Select your email account from the rundown.
  • Click-on, the email account at that point, click on more settings.
  • Presently open the web email setting.
  • Open the active worker tab.
  • Imprint on the main alternative, my active worker (SMTP) requires verification.
  • Click OK to spare the setting.
  • my worker requires confirmation
  • In the wake of tapping on alright, restart the Outlook and check if the pii_pn_b491d1d84f001d28157d Error is eliminated.

Method 3: Delete Duplicate Accounts to Fix pii_pn_b491d1d84f001d28157d Error

Still didn’t get the solution for pii_pn_b491d1d84f001d28157d error code? We should check the copy accounts. It might likewise be the purpose behind Error pii_pn_b491d1d84f001d28157d, and erasing copy records might be the conceivable solution for pii_pn_b491d1d84f001d28157d error codes. Follow the choices underneath.

  • Click-on Menu from the outlook.
  • Open record settings from the menu and click on the mailing tab.
  • Check the copy account in the rundown and select one.
  • Click-on eliminates to eliminate one copy account.
  • eliminate copy account from Microsoft outlook may fix pii_pn_b491d1d84f001d28157d error.
  • After eliminating the copy account, restart Outlook, and check if you observe Error Code [pii_pn_b491d1d84f001d28157d. At that point, the issue is somewhat precarious.  We should proceed onward with method 4 and check whether we are fortunate.

Method 4: Change Server Port Number.

  • Open Outlook
  • Click on the document and Go to Account Setting.
  • Click on Email from the record-setting and select your email account from the rundown.
  • Another window Email Account will be open.
  • Go to more settings and click on Internet Email Settings.
  • Click-on Advanced Tab
  • Presently change the (SMPT) port number from 465 to 587
  • Click on OK to spare changes.
  • change SMTP port number in outlook
  • Outlook setting Smtp port number
  • In the wake of finishing the settings restart outlook and implore that the Error pii_pn_b491d1d84f001d28157d is taken out if you are fortunate the issue is tackled. If not, we have technique 5.

Method 5: Check Your Antivirus Software on your window

In this 5th method for solving pii_pn_b491d1d84f001d28157d Microsoft outlook error, here is a basic answer to fix pii_pn_b491d1d84f001d28157d error. Impair antivirus for some time. It might forestall Microsoft’s Outlook from building up an association with email customers.

Debilitate Antivirus as Following Steps:

  • Select Start
  • Go to Settings
  • Update and Security
  • Windows Security
  • Infection and danger assurance
  • Oversee settings (or Virus and danger assurance settings in past renditions of Windows 10).
  • Each antivirus has various settings to impair it. Check as indicated by the product you use.
  • If the mistake pii_pn_b491d1d84f001d28157d still opposes, try method 6.

Method 6: Uninstall Microsoft Outlook and Reinstall

So you are on strategy 6, and it is because the over 5 strategies didn’t work to fix pii_pn_b491d1d84f001d28157d] Microsoft outlook error. Presently the last answer for the blunder pii_pn_b491d1d84f001d28157d is to uninstall outlook and reinstall once more. In the wake of introducing again, take a stab at including another record.

  • Uninstall Microsoft Outlook with the following advances.
  • Open Program and Features from Control Panel.
  • Quest For Microsoft Office 365 ( Outlook is the part of Microsoft Office)
  • Double-tap on Microsoft office 365.
  • Adhere to the guidance on the screen to finish uninstalling.
  • In the wake of finishing the uninstallation of Microsoft outlook, Install Microsoft outlook again on your device.
  • Make another record, include it in outlook, and take a stab at sending the email once more.


Microsoft Outlook is used in day-to-day communication with another, and it helps to connect with others providing information. Email is considered one of the best methods to communicate and reach your audience. With the changing technology, Microsoft outlook is supported by every one to speak. Errors like pii_pn_b491d1d84f001d28157d may sometimes occur because of the Error. It mostly happens because many accounts are logged in to one device. Try clearing cache and cookies from the device, and reach these steps. The above techniques will help you resolve the Error.

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