How To Fix The Outlook Error 0X80040115?

Solution-1: Clear the DNS Server Settings

Sometimes, the overloaded DNS cache could lead to such an error, so it is essential to clear it.
Search for “CMD” on the desktop and open the Command Prompt.
When the Command Prompt window opens up, input the below command and press Enter.
ipconfig /flushdns
Once the command is executed, see if the Outlook error 0X80040115 is fixed.

The third-party add-ins installed on Outlook could cause the error.

Press the Win and R keys together to open the Run box.

Enter the command Outlook /safe and click OK.

Check if Outlook is working by sending an email to your own email address.

If the error is fixed and the Outlook works normally, click the File menu and select Options.

Under Add-ins, select all the third-party add-ins and delete them.

On the desktop, press the Win and X keys together and click Apps and features.
Select Microsoft Outlook and click the Modify button.
Next, the system will prompt you to choose a repair method.
Select Quick Repair and then click the Repair button.
If the error is not fixed, try the Online Repair method.

If you don’t use an Exchange account, change the profile settings to fix the error.
Open the Control Panel window and select Mail.
In the Mail Setup window, click the Show Profiles button and select Properties.
Under Email accounts, select your email account and click Change.
When the Change Accounts window opens up, click the More Settings button.
In the Security panel, untick the checkbox of ‘Encrypt data between Microsoft Office Outlook and Microsoft Exchange’ and click OK.