1. Check and Correct Server Settings
Incorrect server configurations can trigger the error:
- Open Outlook → File → Account Settings → Account Settings → Email tab.
- Verify that the incoming and outgoing server settings are correct for your email provider (e.g., IMAP/SMTP settings).
- Use the provider’s recommended settings to avoid issues.
2. Repair Outlook Profile
Sometimes, a corrupted profile is the cause of the error:
- Open Control Panel → Mail → Show Profiles.
- Click Add to create a new profile, then set it as default.
- Restart Outlook and see if the error goes away.
3. Run Outlook in Safe Mode
Running Outlook in Safe Mode can help determine if add-ins are the issue:
- Press Windows + R, type Outlook.exe /safe, and hit Enter.
- If Outlook works in Safe Mode, disable add-ins by going to File → Options → Add-Ins and uncheck unnecessary add-ins.
4. Disable Antivirus/Firewall Temporarily
Sometimes security software interferes with Outlook:
- Temporarily disable your antivirus/firewall and check if the error is resolved.
- If disabling it helps, add Outlook to your antivirus/firewall exception list.
5. Clear Cached Credentials
Old or incorrect credentials can cause connection issues:
- Go to Control Panel → User Accounts → Credential Manager.
- Delete any stored credentials for Outlook or email accounts.
- Restart Outlook and enter your login information again.
6. Repair Office Installation
If the Outlook program itself is damaged, this could be the issue:
- Open Control Panel → Programs and Features.
- Select Microsoft Office → Change → Repair.
- Choose Quick Repair first, and if it doesn’t resolve the issue, go for Online Repair.
7. Check Your Internet Connection
If you’re experiencing network connectivity problems, Outlook may not be able to connect to the mail server:
- Test your connection by browsing websites.
- Restart your router or modem if needed.