The dreaded 0x800CCC0F sending error

Anonymous
2022-07-21T19:36:33+00:00

I am now running Microsoft® Outlook® 2016 MSO (Version 2206 Build 16.0.15330.20260) 64-bit, on Windows 8.1; I had been running the 32-bit version, but I upgraded to 64-bit in an attempt to resolve this error on sending: "Task '[email account] - Sending' reported error (0x800CCC0F): 'The connection to the server was interrupted....' "

My Outlook is configured for two IMAP accounts, both with Google - one is a GMail account, the other is Google Workspace account that services email for my domain (59plymouth.net). Outlook is also configured for a work Exchange account.

A few weeks ago - not sure, but I think after a reboot, and when Windows updates were applied - both IMAP accounts stopped sending. The Exchange account continues to work without issue.

The updates were July updates - 5015874, 50156268, and 50154633. Suspecting these, I backed them out and disabled updates. No luck. I then did the Outlook 64-bit upgrade. NADA.

I'd suspect Google, but my iPhone continues to work without issue for both accounts; so does my iPad (which also talks to my Exchange account).

I'm not sure where to go from here. And ideas about how to further diagnose?

adTHANKSvance,

Dan

Outlook | Windows | Classic Outlook for Windows | For business

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  1. Anonymous
    2022-07-22T21:35:07+00:00

    OK - just to sum everything up to this point

    #1 - You've created a new Outlook profile - correct? (That takes a corrupt Outlook profile out of the equation)

    #2 - You configured the accounts again

    #3 - No addins

    #4 - Issue exists even when sending the most benign message

    #5 - This only involves Google accounts

    I'd suggest reinstalling Office at this point but personally think that would be a complete waste of time since only Google accounts are impacted with this

    That leaves 2 other things to try in this quest

    #6 - Do you by any chance have another machine you can try using these accounts to see if this is a machine specific thing?

    #7 - If you turn off EndPoint - does that change anything? (I'd be surprised if it did but have to check)

    *** any words of wisdom yet from the Google folks?

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  2. Anonymous
    2022-07-22T21:21:34+00:00

    OK - so what we have is "sending an email message stays stuck in the Outbox" - that sum it up correctly?

    Yes.

    #1 - Does this happen on any and every message you try and send out?

    Yes. It started a few weeks ago, and it affects outbound email from both my GWA and my GMail account (both hosted by Google). It happened at the same time. My work Exchange email using Outlook is unaffected.

    #2 - Is there anything that these messages have in common? (i.e. an elaborate signature line, attachment, recipients etc)

    Nothing. "test" is the subject, "test" is the body. No attachments, no add'l recipients. No sig. The "To" is either the same account, or the other Google account.

    #3 - Do you use any 3rd party Outlook anti-virus / anti-spam addins?

    Nothing specific to Outlook. I've been running Symantec Endpoint for years.

    To clean this up and trying to isolate things

    #3 - Set Outlook to <Work Offline>

    • to do that, click on the Send/Receive tab and click on the <Work Offline> (only once). This is an on/off toggle button and will turn gray when you're offline

    #3 - Close and restart Outlook

    #4 - Delete everything from the <Outbox>

    #5 - Return Outlook to work online. Not necessary but just to start things clean, close and reopen Outlook

    #6 - Does this happen when you send a simple message to someone, no attachments, no signature etc - just a benign message

    Still have the same problem?

    Yup. Still happening.

    BTW, thank you for not throwing your hands up, running screaming. I much appreciate your efforts to help me.

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  3. Anonymous
    2022-07-22T21:15:38+00:00

    >>

    Oops. I lied. The sync issues are back (for the Google Workspace account).

    <<

    What is the server timeout set to? - it's on the <Advanced Tab> when looking at the email account properties via CTRL+ALT+S as described before

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  4. Anonymous
    2022-07-22T21:07:32+00:00

    OK - so what we have is "sending an email message stays stuck in the Outbox" - that sum it up correctly?

    #1 - Does this happen on any and every message you try and send out?

    #2 - Is there anything that these messages have in common? (i.e. an elaborate signature line, attachment, recipients etc)

    #3 - Do you use any 3rd party Outlook anti-virus / anti-spam addins?

    To clean this up and trying to isolate things

    #3 - Set Outlook to <Work Offline>

    • to do that, click on the Send/Receive tab and click on the <Work Offline> (only once). This is an on/off toggle button and will turn gray when you're offline

    #3 - Close and restart Outlook

    #4 - Delete everything from the <Outbox>

    #5 - Return Outlook to work online. Not necessary but just to start things clean, close and reopen Outlook

    #6 - Does this happen when you send a simple message to someone, no attachments, no signature etc - just a benign message

    Still have the same problem?

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  5. Anonymous
    2022-07-22T21:06:45+00:00

    Oops. I lied. The sync issues are back (for the Google Workspace account).

    17:01:40 Synchronizer Version 16.0.15330.20056

    17:01:40 Synchronizing Mailbox '******@59plymouth.net'

    17:01:40 Synchronizing local changes in folder 'Trash'

    17:02:00 Error synchronizing message 'Fareed: We Need a Kitchen-Sink Climate Strategy'

    17:02:00                                 [800CCC0F-0-0-322]

    17:02:01 Error synchronizing message 'Howard Rudny requested to participate in The Forward Look MoPar '

    17:02:01                                 [800CCC0F-0-0-322]

    17:02:01 Error synchronizing message '"They're all still out there, ready to go."'

    17:02:01                                 [800CCC0F-0-0-322]

    17:02:01 Error synchronizing message 'Michael Jarrett requested to participate in The Forward Look MoP'

    17:02:01                                 [800CCC0F-0-0-322]

    17:02:01 Error synchronizing message 'Question has a reply: The dreaded 0x800CCC0F sending error'

    17:02:01                                 [800CCC0F-0-0-322]

    17:03:08                   252 item(s) added to offline folder

    17:03:08                   10 item(s) deleted in offline folder

    17:03:08 Error synchronizing folder

    17:03:08                                 [800CCC0F-0-0-560]

    17:03:08 Done

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