Every once in a while, Outlook has an error such as “Can’t find host – cannot Locate Server” or “Failed to Connect – Cannot Connect to Server”, error codes 0x800CCC0D and 0x008CCC0E. I found the notes below and thought posting it would be a great way to store the info in case I need it in the future.

I found this very helpful link for troubleshooting those errors and other Outlook errors such as Client Response Invalid.

Some other tips:

  • If outgoing port 25 is being blocked, try setting the port to 587.
  • To clear cache and flush DNS, go to DOS command prompt and enter ‘ipconfig/flushdns’
  • Try Control Panel > Network Connections > Local Area Connections. Right-click and choose Repair

Starting Outlook in SafeMode – Tools > Options > Other > Advanced – Add-in manager, clear checkboxes; restart Outlook