0x800CCC19OfficeMedium
Error 0x800CCC19 — Timeout Waiting for Server | Microsoft Office Fix
Microsoft 365Office 2021Office 2019Office 2016
What Does 0x800CCC19 Mean?
Outlook timed out while waiting for a response from the mail server. The server did not respond within the allowed time.
Real-World Causes
- 1Slow or congested internet connection
- 2Mail server under heavy load
- 3Firewall or proxy causing delays
- 4Large mailbox taking too long to synchronize
Symptoms
- ⚠Send/Receive operation times out
- ⚠Outlook shows 'not responding' during sync
- ⚠Slow email delivery
- ⚠Partial synchronization of mailbox
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DIY Fix
Beginner-friendly steps you can try at home
- 1Increase server timeout in Outlook settings
- 2Check internet connection speed and stability
- 3Try connecting from a different network
- 4Reduce the number of emails to sync (change sync window)
Advanced Fix
For experienced users and IT professionals
- 1Adjust TCP/IP timeout settings in Windows registry
- 2Check for network-level packet loss using ping -t
- 3Optimize mailbox by archiving old emails
- 4Test direct connection to mail server using telnet
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Frequently Asked Questions
What is the default Outlook server timeout?
Outlook defaults to a 1-minute server timeout. You can increase this up to 10 minutes in account settings under More Settings > Advanced > Server Timeouts.
Should I increase the timeout or fix the root cause?
Increasing the timeout is a quick workaround, but you should also investigate why the server is slow. Check your internet speed, mail server performance, and mailbox size.
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About the Author
Windows Troubleshooting Team
Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.