How To Fix Error Code 16999 in Outlook

Error Code 16999 Outlook Fix Step by Step

Applies To: Outlook 2007, Outlook 2010, Outlook 2013, Outlook 365, Outlook 2016

Did you receive error code 16999 outlook? It is a critical error and occurs generally when your Outlook application settings are corrupt.

The exact error may look something like this:

• Task ‘SMTP server name – Sending and Receiving’ reported error
• Outlook is unable to connect to your outgoing (SMTP) e-mail server
• Unexpected Error has Occurred
• Outlook Send Error: “The operation failed. An object could not be found
• Sending / Receiving reported error: “Outlook data file cannot be accessed
• Sending reported error “None of the authentication methods supported by this client are supported by your server”
• The operation timed out while waiting for a response from the receiving server
• Cannot connect to the network. Verify your network connection or modem.

You may face following Symptoms:

• Outlook Freezing or Hanging Problems
• Outlook Crashing Problems or Crashes When you Start it.
• Outlook Stops Responding

It can happen due to any of the reason mentioned below:

• Virus/Malware
• Windows Update/Upgrade
• After updating Microsoft Office
• Proxy Issues
• ISP connection
• Improper shutdown or restart of the system

Solutions to fix error code 16999 outlook

Solution 1: Repair Corrupt files

1. Close Outlook.
2. Right click the Start button in Windows and choose: Command Prompt 
3. In the Command Prompt window type: sfc /scannow (note the space in the command).
4. Wait until the process completes. This usually doesn’t take longer than 25 minutes.
5. Restart your computer and then open Outlook.

Solution 2: Turn off Windows Firewall
1. Open the Control Panel
2. Click on Windows Firewall.
3. If the Windows Firewall is enabled, the Windows Firewall state will be On. To turn it off, in the left navigation pane, click on “Turn Windows Firewall on or off”.
4. In the Customize Settings window, select “Turn off Windows Firewall” and click OK.
Solution 3: Turn of Antivirus Temporarily
1. Locate the antivirus protection program icon on the Windows Notification Area.
2. Once the antivirus icon has been located, right-click the icon and select Disable, Stop, Shut down, or something similar. In some cases, you may need to open the program and disable it using the program’s menus.
Follow the above instructions error code 16999 outlook should be resolved. However, if the error persists, then you should seek professional help.

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