0x800CCC92, is a DTC Intan when we want to dispatch (POP3 / SMTP) or receive (POP3 / IMAP) messages Microsoft Outlook Office (reported on Outlook 2003, but it is valid on all versions).
Although Microsoft place this error as a problem typical Microsoft Outlook Express, caused by Microsoft Exchange Server 2000 and solvable with update la Exchange Server Service Pack 2000 2 (KB309216), these days I encountered the error code in other circumstances:
Task 'mail.domainname.com - Receiving' reported error (0x800CCC92): 'Your e-mail server rejected your login. Verify your user name and password in your account properties. Under Tools, click Email accounts. The server responded: -ERR Authentication failed. '
In this case, the error appeared during a task, when while sending messages, the Internet connection was interrupted, and after reconnecting, the Internet IP was changed (dynamic IP). customer Outlook Office continued to send the rest of the messages to the email server, but the above error message was returned. User / Parola incorrect. 
A fix is not in any way stand in settings Outlook OfficeBut in settings safety / security the e-mail server through the shipping.
Most web / mail servers have security measures against "burglars passwords" cPHulk Brute Force Protection (BFD). In the configuration default of BFD, for Login protection invalid e-mail, is not allowed taskCPC in an e-mail from two IPs at the same time.
If in case of an active task, CONN internet was interrupted and whether IP change after reconnectionIt is advisable to stop sending / receiving e-mails to avoid this situation. Once the error occurred logging 0x800CCC92, solution will stay only administratore-mail server. It will be easy task to unlock your email account.
Stealth Settings - The server responded:-ERR Authentication failed 0x800CCC92.
