The error messages often hint at the root of your problem. In this case, the Outlook 0X800408FC error message tells you that there are two factors that are causing this problem - either you are offline or the hostname is wrong.
This is similar to the problem of email stuck in Outbox.
The server name you entered cannot be found on the network (it might be down temporarily). Please verify that you are online and that the server name is correct.
If you are online, then you can almost be sure it's the wrong hostname problem. But this is not always the case. After updating Windows, many users have seen this error, even if their hostname is correct.
Method 1. Confirm that you are connected to the Internet
Before you start to troubleshoot Outlook 0X800408FC error, you should be aware that this problem is usually caused by connection problems. Therefore, check your Internet connection to make sure you are online.
Check the network icon on the taskbar to see if it is connected. If in doubt, hover the mouse over it. If it receives a message Not connected , that's the source of the Outlook 0X800408FC error. Alternatively, launch a web browser and go to a random site, such as www.windowsbasics.com/. If the page doesn't open, fix your Internet connection.
Method 2. Edit Outlook email account settings
Another factor that can cause Outlook 0X800408FC error is incorrectly configuring Outlook email account settings, such as incorrect hostname. To fix this problem, you need to reconfigure your Outlook.
Method 3. Edit mail server settings
Launch Outlook and click the File menu . Select Account Settings from the right pane. From the drop-down options, click Server Settings.
Verify that the username, password, server, port, and encryption methods are correct. If in doubt, use the following options if available:
- Incoming server port (POP3): 995 or 993
- Outgoing server port (SMTP): 465
- Check the My outgoing (SMTP) server requires authentication checkbox .
- Then, click the OK button to save the changes and restart Outlook.
Method 4. Allow Outlook files to pass through the firewall
Windows Firewall protects the system from malicious activities. Therefore, this solution is not recommended. The article recommends you just try it to see if that is the cause of the Outlook 0X800408FC error.
1. Press the Windows key and look for Firewall. Open Windows Defender Firewall with Advanced Security from the suggestions.
2. Select Inbound Rules and click the Action menu . From the drop-down options, select New Rule.
3. On the Rule Type window , select the Program option and click the Next button .
4. Select This program path and click the Browse button . Go to the following path:
C:Program FilesMicrosoft OfficerootOffice16
NOTE : The path might be different in your Outlook installation and version, especially the Office16 part . Get your exact folder by right-clicking on the Outlook iconand choosing Open file location .
5. In this folder, select Outlook.exe and click Open. Click the Next button to continue.
6. Select Allow the connection and click Next.
7. Mark the checkboxes next to Domain, Private and Public . Click Next.
8. Finally, give the rule a name and an optional description. Click the Finish button to complete the process.
Method 5. PING mail server
Ping is a network connectivity process that tests communication between a particular channel. It is also used to confirm that a network destination is accessible.
First, select the correct mail server and open Command Prompt. For this tutorial, we will assume that your mail server is mail.yourhost.com.
In the Command Prompt window, enter the following command:
ping mail.yourhost.com
Remember to change mail.yourhost.com to your real mail server address. Press the ENTER key after entering the above command to run it.
You will receive a response from the mail server or an error in the process. If the response indicates that the service timed out or the server cannot be found, the mail server is faulty, incorrect, or you are offline.
Method 6. Use Outlook in Safe Mode
Now, Outlook account and connection issue have been fixed. The next step is to confirm that the Outlook application itself is free of errors. For this you need to use Safe Mode.
This method also checks for problems on your profile. Here's how to do it.
1. Press the Windows key and click the search box at the bottom.
2. Enter the following command and press ENTER.
outlook.exe /safe
Select a profile. If something goes wrong, you will immediately get a notification that your profile is corrupt or there is a conflict from other add-ins or softw
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