Outlook 0x800408FC error occurs when the mail server that you ‘re trying to connect to, cannot by found on the network. The “0x800408FC” error during Outlook Send/Receive error, can occur in any version of Outlook (2003, 2007, 2010 or 2013) and usually is happened suddenly and without changing any settings in Outlook program or Network.
The error 0x800408FC commonly happens when you have specified wrong the mail servers (incoming or outgoing) in Outlook mail settings. At this case you’ll be informed from Outlook that “The server name you entered can not be found on the network (it might be down temporarily). Please verify that you are online and that the server name is correct”.
In this tutorial you can find detailed instructions to resolve the 0x800408FC error during Outlook Send/Receive. (Outlook 2016, 2010, 2007 & 2003)
How to Fix the Outlook Send/Receive Error 0x800408FC.
Important: Before you continue to the methods below, first ensure that you have specified the correct mail server settings (Incoming and Outgoing) for your e-mail account.
Method 1. Disable TCP/IPv6 Protocol.
The first and most worked method to fix the Outlook 0x800408FC error, is to disable the “Internet Protocol Version 6 (TCPIP/IPv6)” in your active network adapter. To do that:
1. Press Windows 
+ R keys to open the run command box.
2. Type ncpa.cpl and press Enter.
3. Double click at your active Network Adapter.
4. Click Properties.
5. Uncheck the Internet Protocol Version 6 (TCPIP/IPv6) checkbox and click OK.
6. Launch Outlook to find out if the Outlook 0x800408FC error, during Send & Receive, is solved.
Method 2. Change Mail Server Ports.
The second method to resolve the 0x800408FC error during Outlook Send/Receive, is to change the incoming and outgoing mail server ports in Outlook mail program. To do that:
1. Open Outlook.
2. Go to File –> Account Settings.
3. In Email tab, double click at your e-mail account, to change its settings.
4. Press the More Settings button.
5. At Outgoing Server tab, check the My outgoing server (SMTP) requires authentication checkbox.
6. Then select the Advanced tab and apply the following settings:
1. Check the This Server requires an encrypted connection SSL checkbox
2. Set the Incoming server (POP3) Port to 995 or to 993 if you’re using an IMAP account.
3. Change the Use the following type of encrypted connection to SSL
4. Set the Outgoing server (SMTP) Port to 465
5. Click OK to apply changes.
7. Restart Outlook.
Method 3. Verify that the Mail Server is up and running.
The final method to resolve the 0x800408FC error in Outlook, is to use the old-fashioned ‘ping’ command and check if your mail server(s), is reachable from your network. *
* For example: If your e-mail server’s name is “mail.example.com” then in command prompt give the following command and press Enter:
- ping mail.example.com
– If you don’t receive a response (reply) from the mail server (request time out), or if you receive that the “Ping request could find host” error, but you can access other Internet sites by using your Web browser, then check your firewall settings or speak with your e-mail service provider, to verify that the mail server name(s) is correct and the server is up and running.
Additional help for Google based e-mail accounts.
– If you ‘re using a GMAIL account in Outlook and you receive the 0x800408FC during “Send/Receive” progress (in GMAIL account), then Sign-In to your GMAIL account, by using your Web browser and:
a. Allow Less Secure Applications & Apps to Access GMAIL.
b. Disable the 2-Step verification in GMAIL
c. Unlock the Captcha function
That’s all folks! Did it work for you?
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