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Error: The connection to the server was interrupted. 0x800CCC0F

3 posts in this topic

I’ve got a weird problem at work with Outlook. All of a sudden, some PCs stopped sending mail via the ISP’s STMP server. I have 2 Vista Ultimate PCs with Outlook 2003 and they are working fine (Very odd, but true), a couple XP Pro PCs with Outlook XP and some others with Windows 2000 with Outlook 2000. I keep getting the following error: “Task mail – Sending reported error (0x800CCC0F) : ‘The connection to the server was interrupted. If the problem continues, contact your server administrator or Internet service provider (ISP).’” I have tried everything I could think of to get it back working. The ISP is not at fault cause as I mentioned earlier the Vista PCs working fine. I have tested the STMP port via telnet and it connects perfectly. I have increased the time-out to 10 minutes and that does nothing. I have run the Office Detect and Repair, also tried uninstalling and reinstalling Office. I even tried using another logon account with a clean account, still the same error.

I noticed that the “Test account setting” works fine and even sends the test e-mail. I tried sending an e-mail in Plain Text and it manages to send, but no attachments.

The strange thing is that no changes were done and yet some PCs manage to send e-mail and yet most don't. I have tried sending with Outlook Express and it does work.

Any help?


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My sister has run into the same problem with her XP MCE 2005 laptop (I think it is teh exact same error code she received as well) - I have tried everything I can think of, including seeing if she can upgrade to Outlook 2007 from me - no go. Once she uninstalled Outlook, it would not allow her to install it again - regardless of version. Furthermore, I had her try Thunderbird as well - no go.

She can send via her ISP account without a hitch - but her work mail account is hosed - and she is at wit's end.

I, like you, am hoping someone here will come up with the solution.


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Apperently our ISP neglected to tell us that they changed the MTU value on thier DSL modems....

Had to change from 1500 to 1492.

All is well now.

Thanks anyways.


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