Outlook error 0x800CCC13 shows up when Outlook cannot connect to the internet or reach the mail server, usually right when sending or receiving messages. It’s a connectivity error, not a corrupted file problem, which means the fix almost always lives in the network or account settings rather than in Outlook’s data files.
Key Takeaways
- Error 0x800CCC13 almost always points to a lost or blocked internet connection, not a broken PST file.
- Checking the actual network connection first saves time before touching any Outlook settings.
- Outdated network adapter drivers and firewall or antivirus interference are the most common hidden causes.
- Working offline mode being enabled by accident is a surprisingly frequent trigger.
- Resetting the connection and confirming server settings resolves this error in the vast majority of cases.
How to Fix Outlook Error 0x800CCC13 Step by Step
The steps below follow the order that resolves this error the fastest, starting with the simplest checks and moving toward deeper settings.
Check the Internet Connection First
- Step 1: Open a web browser and try loading a website. If pages won’t load, the network itself is down, and that alone explains error 0x800CCC13.
- Step 2: Restart the router or modem by unplugging it for about 30 seconds, then plugging it back in and waiting for a full reconnect.
- Step 3: On a laptop, toggle Wi-Fi off and back on from the taskbar, or switch to a wired connection temporarily to rule out a weak signal.
Tip: A quick way to confirm the issue is network-related is opening any other app that needs internet access, like a browser or Teams. If those fail too, Outlook is not the source of the problem.
Turn Off Work Offline Mode
- Step 4: Open Outlook and click the ‘Send / Receive’ tab in the ribbon.
- Step 5: Look for the ‘Work Offline’ button. If it appears highlighted or pressed in, click it once to switch Outlook back to online mode.
- Step 6: Try sending or receiving a message right away to see if the error clears.
Check Firewall and Antivirus Settings
- Step 7: Open the antivirus or third-party firewall software installed on the computer and look for an email scanning or email protection feature.
- Step 8: Temporarily disable that email scanning feature, since it sometimes blocks the exact ports Outlook uses to connect to the mail server.
- Step 9: Reopen Outlook and attempt a send/receive again. If it works now, add Outlook as an exception in the antivirus settings instead of leaving protection off permanently.
Verify the Account and Server Settings
- Step 10: Go to File, select ‘Account Settings’, then click ‘Account Settings’ again from the dropdown.
- Step 11: Double-click the affected email account to open its settings.
- Step 12: Click ‘More Settings’, then open the ‘Advanced’ tab and confirm the incoming and outgoing server port numbers match what the email provider specifies.
- Step 13: Click ‘Test Account Settings’ to confirm Outlook can reach both the incoming and outgoing servers successfully.
Tip: If the test fails only on the outgoing server, the SMTP port or authentication setting is usually the culprit, not the whole account configuration.
Update the Network Adapter Driver
- Step 14: Right-click the Start button and open Device Manager.
- Step 15: Expand ‘Network adapters’, right-click the active adapter, and select ‘Update driver’.
- Step 16: Choose ‘Search automatically for drivers’ and let Windows install any available update, then restart the computer.
Common Problems and Fixes
- Error keeps returning after a fresh restart: This usually means the antivirus email scan feature re-enabled itself. Check the antivirus settings again and add a permanent Outlook exception.
- Send/Receive works on one network but not another: A public or work network may block SMTP ports. Switching to a different network or using a VPN often clears this immediately.
- Test Account Settings passes but the error still appears during normal use: Corporate or ISP-level firewalls sometimes allow the test but throttle live traffic. Contacting the network administrator about port access resolves this.
- Error only happens with one specific email account in a multi-account profile: The issue is isolated to that account’s server settings. Repeat the account settings check for that account only rather than the whole profile.
Frequently Asked Questions
What does Outlook error 0x800CCC13 actually mean?
It means Outlook could not establish a connection to the internet or the mail server at the moment it tried to send or receive email.
Does error 0x800CCC13 damage the PST or OST file?
No. This error is a connectivity issue and does not affect the integrity of the mailbox data file.
Why does this error appear only when sending, not receiving?
That pattern usually points to an SMTP port or outgoing server authentication issue rather than a general connection problem.
Can antivirus software really cause this error?
Yes. Many antivirus programs include email scanning that intercepts the same ports Outlook uses, which can block the connection entirely.
Will restarting the computer fix error 0x800CCC13?
Sometimes, especially if a temporary network glitch or a stuck driver is the cause, but checking the settings above gives a more reliable fix.
Is this error related to a Microsoft 365 or Outlook outage?
It can be, but that is easy to rule out by checking whether other internet-dependent apps are also failing to connect.
How long does it usually take to resolve this error?
Most cases resolve within a few minutes once the network connection and Work Offline setting are confirmed.
Does this fix apply to both Outlook for Windows and the new Outlook app?
The network and offline mode checks apply to both, though menu names in the new Outlook app may appear slightly different.
What should be checked first if none of the steps work?
Confirming the internet connection is genuinely stable outside of Outlook is the most important first check, since every other step depends on that.
